WM8850-MID Tablet Firmware Files and Root Instructions

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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
ro.build.fingerprint=WonderMedia/wmid/wmid:4.0.3/IML74K/_120525.1106:eng/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: http://205.196.123.75/8g6cf6nekcig/lpqw9v9ypdemq00/WM8850_MID7_PuZhi_W01_8223_FT5206_W70_WMC1579.7z

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…

RootBurner

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).

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Mia
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Mia

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…

Kseg97
Guest
Kseg97

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!

Joshua
Guest

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.

matt
Guest
matt

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

richard
Guest
richard

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?????

richard
Guest
richard

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

richard
Guest
richard

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 ????

richard
Guest
richard

??

richard
Guest
richard

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

Steve
Guest
Steve

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

djarthur
Guest
djarthur

Hi,

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

Thanks

djarthur
Guest
djarthur

@cnxsoft Here is the firmware, ftp://202.105.131.8/W70-1.5.5-1680-NO-WIN8-1.10.zip, 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.

grammarus
Guest
grammarus

@djarthur
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?

Sgdva
Guest

@cnxsoft
I found this topic and they say there is JB now.
http://www.techknow.t0xic.nl/forum/index.php?topic=4546.0
For ftp, copy it manually to adress bar and get ride of the “.” at the end.
ftp://202.105.131.8/lisa/w70-4.1.zip

zz
Guest
zz

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

Ceda
Guest
Ceda

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 …..

corne basson
Guest
corne basson

Hi

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…

Steam
Guest
Steam

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

Steam
Guest
Steam

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

ZUka
Guest
ZUka

Optimized JB for this tablet and its working smoth much better than stock.
http://www.techknow.me/forum/index.php?topic=5101.0

mauro daniel
Guest

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

john
Guest
john

le actualice pero ahora no me da tactil

mauro daniel
Guest

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

Dedge
Guest
Dedge

Hi..

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

Dedge
Guest
Dedge

can’t find 🙁@cnxsoft

Maxim
Guest
Maxim

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.

Maxim
Guest
Maxim

@cnxsoft
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?

Maxim
Guest
Maxim

@cnxsoft
Thanks a lot! I will try to do so.

Romina
Guest
Romina

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!!

Leon
Guest
Leon

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?

Jim
Guest
Jim

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

Jonah
Guest
Jonah

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