Home > Android, WonderMedia WM8XXX > WM8850-MID Tablet Firmware Files and Root Instructions

WM8850-MID Tablet Firmware Files and Root Instructions

I’ve bought a noname tablet described as W8850-MID in the Android Settings that did not come rooted, and after several attempts trying to find how to root the tablet I had more or less given up, as tools such as UnlockRoot or OneClickRoot did not work with the device.

After not using my tablet for 2 months, I started it again, but it just showed the Android animation forever, and failed to boot to the home screen. So I had to do something and finally managed to find firmware files for the device and root it. I’ll explain the whole process I went through in this post, but basically all you have to know is that if you have the same WM8850-MID tablet as I have (WM8850_MID7_PuZhi_W01_8223), it is fully compatible with Eken W70 and you can just install the latest W70 firmware (v1.10) from Eken support site that comes already rooted or use a tool called RootBurner (if you want to keep your apps and settings). RootBurner will work for a wide range of WM8850 based tablet, and not only for “WM8850-MID” tablet.

WM8850-MID Firmware Files

Before you try to root your device with any tools, it’s strongly advisable to get the firmware for your tablet in case things go wrong. One of the main issue for Wondermedia WM8850 based device is that there seems to be lots of different firmware, and each of those may not be compatible with your device, which you could brick by using the wrong firmware. So caution is advised. Of course, if you have bought a tablet directly from one of the Chinese manufacturers that release firmware for there tablets that may things much more easy. But what I you don’t?

One way is to get some strings specific to your firmware or hardware. One way to do that is to look into the build description / date fields in /system/build.prop file. WM8850-MID tablet build.prop contains the following:

ro.build.date=Fri May 25 11:09:35 HKT 2012
ro.build.description=wmid-eng 4.0.3 IML74K _120525.1106 test-keys

Then I did a google search for “wmid-eng 4.0.3 IML74K _120525.1106” and was able to find the exact firmware installed on my tablet:

I downloaded it and checked build.prop and default.prop files were identical to the ones in my tablet. Good! So I have a backup firmware in case rooting failed in a bad way.

Rooting WM8850-MID Tablet

Firmware update method

This one is the easiest, but if you already have applications and games loaded on your tablet, you’ll have to reinstall those and reconfigure all your settings.

  1. Download W70-1.1.0–2012-08-15.rar from Eken website (Alternative link)
  2. Uncompress the archive and copy wmt_scriptcmd script and FirmwareInstall directory to a micro SD card (it does not need to be blank and you can have your other files there)
  3. Insert the micro SD card in the tablet, reboot it, and let the firmware install itself
  4. Remove the micro SD card, the system will reboot and you should now have a rooted firmware in your tablet.

Remember to delete wmt_scriptcmd and FirmwareInstall from the micro SD card, if you use it with your tablet, or firmware update will start after each boot…


If you don’t have rooted firmware for your WM8850 tablet, or don’t want to lose your setting and apps, you can use RootBurner, a tool for WM8850 written by diabetu.

  1. Check the Build Number on your tablet, which is indicated on the bottom left corner at boot time.
  2. Then download the proper version of RootBurner from http://nanospic.ro/?p=327. For Build Number v0.9.5, you can use http://adf.ly/Cgl4Q or http://4a0fec40.linkbucks.com/. There are others version for newer Build Number,  as well as RootBurner specific to Cherry, MaPan and Veedee tablets.
  3. As you extract RootBurner “tool”, you’ll find out that this is actually a firmware update package with wmt_scriptcmd and FirmwareInstall, but it only update the files required to gain root access.
  4. Copy wmt_scriptcmd and FirmwareInstall to a micro SD card
  5. Insert the micro SD card into your tablet, reboot, and let the firmware update complete
  6. Remove the micro SD card, the tablet will reboot, and you should now have root access.

I’ve tried RootBurner with Build Number 0.9.5, and it works fine. In adb shell, I can run su, which generates a segfault, but still switches to the root user (prompter changes to #).

Update: If rooting still fails on your tablet, one person had success with Root_with_Restore_by_Bin4ry_v16 (link).

  1. Mia
    November 15th, 2012 at 00:59 | #1

    thank you for this instructions. I bought similar tablet from AliExpress and it hang during boot process. I spent 2weeks reading Android forums and understanding how it works. I didn’t expect it’s so simple…

  2. November 15th, 2012 at 09:14 | #2

    Glad my post could help.

    Well, it took me 6 months to realize my tablet was actually exactly the same as Eken W70. But finally when my tablet failed to boot, I really had to look into it and eventually found out I could just use Eken firmware.

    Rooting was quite difficult on this tablet until diabetu published the RootBurner.

  3. Kseg97
    December 1st, 2012 at 06:18 | #3

    Could you please put the firmware for the W70 on another server, like mediafire.com or rapidshare.com?
    I cant download it from Eken’s support page; And I really need it.

    Thank You!

  4. December 13th, 2012 at 18:58 | #5

    Thanks a bunch! Rootburner tool works great. Any ideas on how to put JB on our Cortex A9 tablet? Allwinner Cortex A8s are already getting custom made CM10 roms.

  5. December 13th, 2012 at 19:51 | #6

    I don’t see any work done on WM8850 for Jelly Bean. I guess we’d have to rely on Eken to provide Android 4.1 support, but I believe that’s unlikely, as many new low cost tablet will now move to dual core and cortex A7 processors.

  6. matt
    January 14th, 2013 at 05:59 | #7

    very helpful, but can this my tablet(wm8850) slowerthanks very

  7. January 14th, 2013 at 09:09 | #8

    The firmware update should just make your tablet more stable. I haven’t noticed any performance degradation or improvement.

  8. richard
    January 17th, 2013 at 15:57 | #9

    hi there, ive downloaded the file and opened it in zip but cant seem to find “wmt_scriptcmd script and FirmwareInstall directory” to copy onto an sd card? please help…….. or do i put the whole file i downloaded onto the sd card?????

  9. January 17th, 2013 at 15:58 | #10

    What’s inside the file then?

  10. richard
    January 17th, 2013 at 16:09 | #11

    i dont know how to describe really its a long list of files?? right at the bottom there there is another zip file but i cant open it?

    the first one is wmtinst_11_3rd.sh

  11. January 17th, 2013 at 16:13 | #12

    Did you download W70-1.1.0–2012-08-15.rar or the alternate link?
    I could never manage to complete the dowload from eken website, so I’ve used the alternate link.

  12. richard
    January 17th, 2013 at 16:19 | #13

    yes i downloaded W70-1.1.0–2012-08-15.rar, so on my desktop i have W70-1.1.0–20120815 as a zip file i open that and there is just loads of stuff in there, now i have right clicked it and extracted it, no i have W70-1.1.0–20120815 as a normal file open that and i have firmwareinstall open that and i have 3rd part, config, customization and autorun ????

  13. richard
    January 17th, 2013 at 21:25 | #14


  14. January 17th, 2013 at 21:53 | #15

    You should just need to do this: “Copy wmt_scriptcmd script and FirmwareInstall directory to a micro SD card”.
    If you don’t have this, try the alternate link.

  15. richard
    January 17th, 2013 at 22:02 | #16

    from the zip file???? i tried the alternate link, its foreign, i cant understand it.

  16. Steve
    January 29th, 2013 at 09:12 | #17

    My Andriod 4.0 system would come online, have a window saying “Unfortunately, Andriod 4.0 has stopped can somebody help me.

  17. djarthur
    February 2nd, 2013 at 00:54 | #19


    is anybody has tried to install this New Firmware W70-1.5.5-1680-NO-WIN8-1.10.zip release on 15/01/13 from Eken’s support page in a WM8850-mid tablet with the camera on the side..??

    if any. please comment your experience, i think it’s coming with Jelly Bean 4.1, but not sure


  18. February 2nd, 2013 at 10:48 | #20

    I can’t see that firmware for W70 tablet on Eken support site. I’d guess all it does is to remove the Windows 8 launcher from the firmware.

  19. djarthur
    February 3rd, 2013 at 00:45 | #21

    @cnxsoft Here is the firmware,, my WM8850-mid tablet has Build Number 1.5.0 with Windows 8 launcher, and got freezed twice or more per hour when playing games, i’d like to know if this Firmware solve this issue..? Eken support site does not say anything what’s news in their New Firmware releases, they just Released.

  20. February 3rd, 2013 at 10:34 | #22

    Thanks. Finally I see it, it’s on the top of list of firmware in the support site. I wonder why they show 2 different firmware for W70 there.
    Maybe I’ll try it since I’m still at 1.10.

  21. February 3rd, 2013 at 13:51 | #23

    Arg.. The download failed after 5 hours. I think I’ll give up until a mirror is available.

  22. grammarus
    February 4th, 2013 at 20:28 | #24

    I also have the same problem with my eken WM8850-mid tablet Build Number 1.5.0 with Windows 8 launcher, it freezes.. so i press the reset button.. have you already used that firmware without windows 8 launcher?

  23. February 5th, 2013 at 15:00 | #25

    I found this topic and they say there is JB now.
    For ftp, copy it manually to adress bar and get ride of the “.” at the end.

  24. February 5th, 2013 at 15:24 | #26

    Thanks They also have a custom ROM at techknow. I’ll have to try it.

  25. zz
    February 14th, 2013 at 19:57 | #27

    Have u tried jelly bean update? is it better with JB or ICS?

  26. February 14th, 2013 at 22:01 | #28

    Yes, I should do that some day… I need to study a bit to make sure Titanium backup works between different Android versions first…

  27. Ceda
    February 19th, 2013 at 15:15 | #29

    Hi All,

    As I posted before I was having trouble with my tablet model wm8850 touch screen. Tried various roms but nothing worked. As the utmost stupidity without giving it a second consideration I flashed it with http://veedee.in/download/E-10.rar, which brought to an end of my tablet.

    Now its only black screen. it wont re flash , wont be recognized by my PC also.

    Can some one please help me restore this tab. At this moment I even cant find the model of this tablet. These are the picks of the tab. Can some one please help me identify this tab and restore this.

    On the box it says “MID”
    And on the tab it says model WM8850
    Front cam on the middle back cam on the side
    With SD card slot and data cable slot ( OTG)
    (Cant seem to recognize this model on the net as well )

    I would highly appreciate if any one can help me restore this tab again.

    Thank you soo much …..

  28. corne basson
    February 22nd, 2013 at 02:06 | #30


    My WM8850 recently stalled on the boot (ice cream) tried everything, now it’s on a black screen. i can see there is power, but nothing else. I am tired of searching, I need to fix this thing or throw it in the dustbin. I am not a technical person, but follow instructions well. Oh, and I am a female!

    I need links and instructions! Please help! It is such a lovely little tool. Don’t really want to throw it away…

  29. February 22nd, 2013 at 11:59 | #31

    @corne basson
    Hi Female!

    Did you read the post above? Section “Firmware update method”. You just need to make sure it’s the right model (read the full post to find out).

  30. Steam
    March 14th, 2013 at 03:49 | #32

    Thanks I just successful in upgrading the build no. from 1.0.2 to 1.1. what do i do now to upgrade from ICS to jellybean

  31. Steam
    March 14th, 2013 at 03:51 | #33

    trouble. It is now automatically rebooting into recovery mode!! with the android image in danger.!!

  32. ZUka
    March 15th, 2013 at 23:16 | #34

    Optimized JB for this tablet and its working smoth much better than stock.

  33. March 29th, 2013 at 11:33 | #35

    Hi I have a question the same Chinese tablet but the version number says V1.5.0 and v0.9.5 says yours has something to do other things being equal please respond thanks

  34. john
    March 31st, 2013 at 08:23 | #36

    le actualice pero ahora no me da tactil

  35. March 31st, 2013 at 09:29 | #37

    If you lost touchscreen support, that means this firmware is not for your tablet.

  36. April 1st, 2013 at 01:44 | #38

    My tablet has the build number 1.5.0 and no rootburner for that?. Well hope and help me with this

  37. April 1st, 2013 at 10:55 | #39

    @mauro daniel
    On rootburner site some people have tried the version for 1.4.0 on 1.5.0, and it worked.

  38. Dedge
    April 3rd, 2013 at 19:26 | #40


    i want to try this fimware because my WM8850 is only loading…
    but my net so slow could you please upload this firmware to another site like 4share ,mediafire,hotfile
    hope you respond me..thanks

  39. Dedge
    April 3rd, 2013 at 19:27 | #41

    can’t find 🙁@cnxsoft

  40. Maxim
    April 9th, 2013 at 17:38 | #42

    Hi All!
    I have noname 9″ tablet with wm8850 chip inside, the label on board says SV59A-STZL-PFD-9″ and some china letters. I try to find this model in internet- but find some clones like -“SV59A 9″ Android 4.0.3 VIA8850 1.2GHz Tablet PC with HDMI, Wi-Fi, Capacitive Touch 8GB” I can’t check versions and other information about my tablet – because it does not boot any more.
    The problem is that this tablet was flashed from microSD card with wrong firmware (WM8850 Universal Uberoid v1.0 JB 4.1.1) and now it have black screen – no boot, just take some current from battery. Is any one can help me identify this tab and reflash it – if it’s possible? I would highly appreciate if you can give me instructions to get it back to work.

  41. April 9th, 2013 at 17:50 | #43

    Try to ask the shop where you bought it. They may have the firmware, or know where to download it.

  42. Maxim
    April 9th, 2013 at 18:33 | #44

    Thank you for your answer! that is problem – the shop is unknown, I got it hand by hand. The brand is noname – it also give me trouble, even if I bring it to service-centr, they need also to recognize it. If any software tools ( may be with some jig cable) exist for my case, or its end of the end?

  43. April 9th, 2013 at 19:13 | #45

    I don’t really know. If you can access adb, then you may look for the build.prop file to find out your firmware and model number. If you can’t, you may want to ask to http://www.techknow.me/forum/index.php?board=112.0, if you haven’t already done so.

  44. Maxim
    April 9th, 2013 at 20:00 | #46

    Thanks a lot! I will try to do so.

  45. Romina
    April 12th, 2013 at 10:29 | #47

    Thank you very much! with this I could relive my mini via WM8850 Netbook! accidentally delete the launcher and not loaded, follow the instruction from here and it worked wonderfully! Kisses from Argentina! Sorry for my English

    Muchisiiiiimaaaa gracias!! con esto pude revivir mi mini Netbook via WM8850! borre sin querer el launcher y no cargaba, segui las instruccion de aqui y funciono maravillosamente! Besos desde Argentina!!

  46. Leon
    May 16th, 2013 at 05:17 | #48

    I have a *Netbook* (NOT A TABLET!!!) model WM8850-mid. It has a 1.5Ghz Via 8850 CPU, 1Gb RAM, Android 4.03 Build 1.40. It has no brand name on the hardware, the name “Wondermedia” in settings/about. Even there, it’s called a tablet, so maybe the firmware is the same, but maybe it’s not.

    I tried Rootburner. It seemed to work, told me my “tablet” was rooted, and restarted. Rootcheck says it’s not. Typing “su” in Terminal Emulator says I’m not allowed to su. Trying to install Busybox fails because it’s not rooted.

    What do I do now?

  47. Jim
    June 5th, 2013 at 18:36 | #49

    My gallery,web browser and calculator have been accidentally deleted. Will this update restore them?

    • June 5th, 2013 at 19:02 | #50

      Yes. It will restore them, but you’ll lose all your existing settings, unless you use apps such as Titanium Backup before firmware update.

  48. Jonah
    June 8th, 2013 at 11:28 | #51

    This may be out of this subject but how do you do a recovery boot on this tablet? and yeah thanx the update worked!

  49. June 8th, 2013 at 11:31 | #52

    Sorry, I don’t know, and I’ve stopped using this tablet as, after one year, my battery is virtually dead (15 minutes on a charge).

  50. jason
    June 10th, 2013 at 08:29 | #53

    Do i need to copy the file so a sd card?i tried copying them to my internal storage but it didnot work.

  51. June 10th, 2013 at 11:08 | #54

    The firmware needs to be copied to a micro SD card.

  52. June 20th, 2013 at 09:57 | #55

    hi there,friends admin please help i have android os 4.0 kernel 3.0.8 and build number v1.2.0

  53. June 25th, 2013 at 19:37 | #56

    hi there,friends admin please help i have android os 4.0.4 kernel 3.0.8 and build number v1.5.0

  54. Rasheeda
    June 27th, 2013 at 15:53 | #57

    hi there, i have the WM8850 mid android version 4.0.3 kernel 3.0.8 build 4.0.3 ICS ver 1.5.2 – 2012211727 tablet. Tablet was stuck on the android logo and not booting up. installed the firmware and now its showing a black screen – probably bricked. what can i do to unbrick this tablet. please help! urgent. I’m not technically inclined so please use “normal” language when responding. Thank you!

  55. Denise J
    August 14th, 2013 at 20:34 | #58

    Got a freebe with the purchase of a mattress, called MID Android it worked 1 wk now all I get is the Android screen, none of the resets work. Any ideas.

  56. songa
    August 28th, 2013 at 18:20 | #59

    Hi all. Please help me with this, now I need flash rom tablet WM8850 Cortex-A9 model 1.5GMHz, who themselves claim to okay, thank you very much.
    This is the number of machines :

  57. Cristian
    September 2nd, 2013 at 17:52 | #60

    Perche non si avvia in automatico?

  58. Cristian
    September 2nd, 2013 at 20:41 | #61

    Non parte in AUTOMATICO

  59. znsheikh9
    September 30th, 2013 at 00:09 | #62

    Can you please make it clear for me?

    My WonderMedia WM8850-mid tablet just stays on the Android sign forever and I can’t access my tablet
    Do you download the thing from wmid-eng 4.0.3 IML74K _120525.1106 on your computer or on the tablet?


  60. Luimar Luna
    October 4th, 2013 at 11:32 | #63

    Hola. Tengo una Netbook modelo EPC-1030T con Chip VIA wm8850. No pasa de la pantalla de inicio de Android. De casualidad la tuya es parecida a este modelo o que modelo es la tuya para yo guiarme y saber si este firmware le funciona a la mía? Muchas Gracias desde Venezuela.

    November 17th, 2013 at 11:35 | #64

    how to open bluetooth in 7 netbook tablet kernel version 3.0.8 model number wm8850-mid

  62. Ralf
    December 4th, 2013 at 03:53 | #65


    and first time sorry for my bad english and the help of Google translator. The article is a bit older and some links no longer work. Unfortunately I can not find anything more recent what my problem comes close.

    I have an Android 10 inch Android Netbook with Android 4.0.3, kernel version 3.0.8 and firmware Build Number 1.5.0. The model designation is WM8850: x6-10V. As a Via CPU 8850 ARMv7 rev.0 running at 1.2 Ghz. The display makes a resolution of 1024 * 600 and is driven by a Mali 400 CPU. Ram it has 1 Gb, for Aps even 1 Gb and 2 Gb for local storage. A manufacturer is not visible outside of the unit, but it should be at Wonder Media.

    Google gave me as a result RootBurner. RootBurner unfortunately does not work on my netbook. A matching Rootfirmware (like the Eken) I could not find and the links to the ftp servers of the manufacturer can not be opened.

    To Romina (# 47) from Argentienien it worked, at Leon (# 48) it did not work and Luimar Luna (# 63) has probably a bigger problem with his netbook.

    I hope it can someone help me with some useful links, or even matching firmware files and possibly Android Jelly Bean.

    I originally wanted to just install XBMC, but this probably will fail at some write permissions in the instalation or when first starting. So I want to try to root for the netbook to install XBMC again.

    Greetings and thanks for your help

  63. vinny
    December 23rd, 2013 at 00:47 | #66

    ralf did you ever find the jelly bean firmware ?

  64. December 27th, 2013 at 08:39 | #67

    Is there a way to root my WM8850 NETBOOK (Its not a tablet though, but suppose it is) without loosing installed apps, files, app settings, and will not affect the curser? ALL I NEED IS TO HAVE A ROOT ACCESS, and thats all. Can anybody provide me a link or a clear instructions? Below are the nessesary informations I think needed to be provided. I found those at the Settings. Thank you in advance 🙂

    Model number
    PID7_8198_normal (when “WM8850-mid” tapped many times)
    Android Version
    Kernel Version
    Build number
    4.1.1 JB ver1.3.1 – 20130226.074624

  65. December 27th, 2013 at 09:24 | #68

    Have you tried rootburner?

  66. anric
    December 28th, 2013 at 18:45 | #69


    It was ULTRA easy! hahhahahha! thank you anyway! thank you for the immediate response!

  67. Ralf
    January 4th, 2014 at 02:29 | #70


    yes I have found JB here is the link:


    There are several versions running on the tablet, but for me with little problems. I have problems with the keyboard layout, although the umlauts are there, but not like on the hardware keyboard of the netbook. The second problem is that the display on some websites something flickers. By the way, XBMC does not work even with JB on my netbook.

    Greetings Ralf

  68. Andy
    January 23rd, 2014 at 21:12 | #71

    WM8850 1.25G 6.98″TFT 800*480 DDR 512MB

    Hi guys if you are struggling with this specific no name chinese netbook look no further!


    WM8850 1.25G 6.98″TFT 800*480 DDR 512MB

    First you have to Format SD card to FAT (quick format in Windows will do)

    Then you need to Download Rootburner and install the extracted contents to SD card


    Load SD card and making sure Netbook is switched off hold down the power button until it begins.
    It should install and tell you to remove SD card.

    Come back to PC and Download WM8850_Uberoid_v0.5_JB_4.1.1_[TechKnowForum.net]


    You will prob have to register first, here is the page containing the download if you do have to register, so you can bookmark it.


    Now Format the SD card again, and this time extract and copy the contents of the WM8850 Uberoid package to the SD card.

    Install to Netbook (making sure power is off again)

    Hold down Power button till Install starts, leave for around 5 minutes.
    Should tell you to remove SD.

    Android 4.1 Fresh install complete.

    It took me ages to solve this, and i did it for a friend so no £.
    Hope that this info helps some one out.

  69. Ariel
    February 21st, 2014 at 23:01 | #72

    Hola… este firmware servira para el modelo via wm8880? sino podria decirme donde lo puedo encontrar? muchas gracias

  70. joseph
    May 9th, 2014 at 18:45 | #73

    how can I repair my tablet saying unfortunatry gallery has stopped .

  71. Jozue
    June 22nd, 2014 at 10:13 | #74

    Bro tengo una tablet MIDM-M803 tendras el Firmware, es jelly bean 4.1 cuando la enciendo me sale el monito de android con el simbolo de alerta rojo y no puedo entrar al menu recovery

  72. masoud
    August 21st, 2014 at 18:49 | #75

    hi all
    i have 10.1” notebook when i on my notebook the logo of android came but dont go on and stop it
    can you help me
    and can you say me how can reboot notebook

  73. Usuario_encabr
    November 8th, 2014 at 08:48 | #76

    Utiliza el ADB y el driver de Android.
    Este tutorial resuelve todo el problema:
    Funcionò con mi tablet Zonar Technologies donde no funciona lo del boton abajo + power… RECOMENDADO!

  74. Need help plzz
    March 27th, 2015 at 11:02 | #77

    Hi can someone plz help me. I have a wm8850-mid jellybean an it keeps popping up ota has stopped working when i press ok nothing happens it jus pops up again. In the settings/about device there is no system updates option i havnt a clue how to fix it id appreciate any an all help plz. Thx

  75. Yosne
    May 30th, 2015 at 07:38 | #78

    brother someone will know how to root the tablet tr10cs1 ?

  76. Navtej
    August 13th, 2015 at 21:28 | #79

    I have wonder media tablet
    My tablet’s ram reduced from 1gb to 512 I installed original firmware but it doesn’t works.how can I get 1gb ram again…

  77. Axel Jony
    February 16th, 2016 at 20:03 | #80

    Hi, Grateful if you could help me find a firmware or link, for my tablet 10.1 (with processor ATM7021A AND MBoard T1026) which not booting. I tried a lot of web scerchs , NOTHING works. Sincerely thanks, Axel

  78. Nox
    June 6th, 2016 at 08:50 | #81

    I installed wrong firmware on my wondermedia tablet and it neither turn on and nor detected by pc via usb I have its original firmware but after bricked I insert the sd card press power buton but nothing happen, can anyone tell me a way to debrick it?

  79. MrsBleezzy
    January 13th, 2017 at 03:34 | #82

    Thank you so, so, soooo much! This was entirely to easy to be trrue, Completed all steps in under 15 min, it worked great

  80. Alen
    May 6th, 2017 at 23:54 | #83

    Could you please put the firmware for the W70-1.1.0–2012-08-15.rar on another server or refresh the link?

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