How to Install 64-bit BIOS on Sunchip CX-W8

Sunchip CX-W8 is an Intel Atom Z3735F TV box running Windows, but I’ve been informed that originally Sunchip designed it for WeTek in order to manufacture a Linux based mini PC. Unfortunately, they finally gave up once they discovered Intel had no intention to work on HDMI audio support in Linux for their Atom Z3700 series processor despite it working on Android… Intel Compute Stick will apparently use a separate DSP to handle that part (TBC).

Nevertheless, when WeTek saw I had Wintel W8, they decided to share the 64-bit “BIOS” they had worked on for the Linux port. By the way, Wintel W8 and Sunchip CX-W8 allegedly come from two different factories / design houses, so although they look alike, the hardware might be different, and the UEFI firmware / BIOS, I’m about to share may or may not be compatible with Wintel W8, so you may brick it if it is not already bricked…

If you want to install a new version of the BIOS, or possibly unbrick your device (TBC), you can download and extract CX-W8_64-bit_UEFI.tar.7z. You should get three files:

  • H2OFFT-S.efi – H2O UEFI Flash Firmware Tool
  • M64.W8ANNA01.ROM – 64-bit BIOS
  • STARTUP.nsh – startup script

Copy these three files to the root directory of a USB flash drive formatted with FAT32, and insert the drive into one of the USB ports of CX-W8 mini PC. Power on the device, and press the “Esc” key on the keyboard repeatedly (not press and hold) until you see the menu below.Sunchip-CX_W8_BIOS_Installation Now select Boot Manager with the keyboard’s arrow keys and Enter, and select Internal EFI shell.

CX-W8_UEFI_FirmwareAs you press Enter,  the BIOS installation should start.

CX-W8_BIOS_InstallationOne installation is completed, the PC will reboot, and you can install the 64-bit operating system of your choice. I’m also trying to get the 32-bit BIOS for people who want to unbrick their device to re-install Windows.

I have not tried these instructions myself, but I know at least two persons who bricked their CX-W8 or W8 mini PC, so hopefully, we’ll get some feedback soon.

Share this:
FacebookTwitterHacker NewsSlashdotRedditLinkedInPinterestFlipboardMeWeLineEmailShare

Support CNX Software! Donate via cryptocurrencies, become a Patron on Patreon, or purchase goods on Amazon or Aliexpress

ROCK 5 ITX RK3588 mini-ITX motherboard

102 Replies to “How to Install 64-bit BIOS on Sunchip CX-W8”

  1. I will wait for Wetek to make their quad core and for sure will buy it, this guys know what they are doing. For me was enough to see how good their support is and how positive critics people giving to them. I hope they will soon publish Quad core device.

  2. DroidMote developer tried:

    “Ubuntu 64 bit install without problems, but the same audio problem.
    Windows 64 bit stop the installation after 2 seconds from boot. Cause bad signature i think.

    Why with a 64bit uefi i can’t install windows 64bit ? what i need ?
    The setup start but there is protection error like i need some keys from Microsoft.”

  3. I have the same problem after update bios it don’t boot windows and blue screen
    Can you provide us with old bios files?

  4. if you have flashed the bios 64 bit apparently there are no way to flash the bios 32 bit because the “flasher” is a 32 bit executable and don’t mach with the 64 bit that you have installed.

    From here you can download a file containing the files that permit you to flash the 32 bit bios for CX-w8

    Just copy the files on a pen fat32 and boot from it.
    You have to use it only if you have already installed a 64bit bios and you want to go back to a bios 32 bit.

    This worked for me.

  5. I’m having problems with my WINTEL W8, because it shutdowns if it gets hot only making it work a little more, like using KODI. The main problem is that the BIOS of this MINIPC has a lot less options than the WINTEL CX-W8 and cannot control the shutdown temperature. When i try to ask for a BIOS update to the seller he says “Sorry, it can’t update by personally”.
    This BIOS update would work with my WINTEL W8? Or it will make it brick?

  6. was somebody able to install windows 8.1 in any version with this 64 bit bios ? it always crash the installation after the boot.
    With linux ubuntu 14.04 it was ok (the only problem is the audio), even the wireless is working after the Linuxium patch that unfortunally does’nt fix the Audio problem on CX-w8.
    After plenty attempts i had to reflash the original 32 bit bios

  7. Probably the only one here that wants to install an older O/S… Windows 8 is just to bloated for want I want to do with this device.

    Anyone successfully installed Windows XP on this? Or Windows 7

  8. Same problem as sekoto. After some hours, it shutdown, and I checked the processor activity was always under 60%, any solution?

  9. The main problem is the design of this MiniPC. This Intel procesor needs fan refrigeration, because it doesn’t have good ventilation, and when it gets hot that increases until near 100º Celsius then it shutdowns automatically.
    I think we need a new design DIY to get good refrigeration to the main core of this MiniPC.
    Also we need some active solutions in the BIOS to prevent use of this CPU doing overclocking, more underclocking to have less temperature.

  10. It’s not as hot, for me, Iv’e installed Core Temp, it indicates 30°C at 50% processor usage. The first thing I did it was to modify the “energy management” in Windows to never shutdown. But no success. And since I’ve installed DontSleep, It didn’t reboot for 3 days. Maybe a problem with Windows?

    Another point, as I cannot activate the license provided, can I put a Windows 8.1 Pro license? In order to have Remote Access activated? I use VNC now but not very happy with…

  11. Hi,

    So can anyone confirm that openelec is working with this bios? CNC can you check?

    Best regards

  12. Is there any way to flash the bios from windows?
    I accidentally disabled the USB controller and so I can’t use the keyboard to access the bios and reset everything, so I wanted to re-flash the BIOS in order to reset to the default settings.

    Intel’s FPT tools says “Error 286: Unable to write data to flash with SPI lock enabled.”

  13. Do not flash this, it will allow you to install 64bit OS systems, but if you want to use ubuntu, there is no chance to get sound to work. I tried it and tested every version of linuxiums isos. Where 32bit bootloader worked (regarding hdmi audio and wifi) with the 64bit loader sound is not working.

  14. Sadly this 64-Bit BIOS didn’t enable me to install Windows 10 64-Bit. It allowas me to start the setup, unlike the 32-Bit UEFI, but fails with an “ACPI_BIOS_ERROR”. 64-Bit Linux Mint installed no problem however.

  15. can someone help me please i updated the BIOS with the 64 UEFI zip files it gave me an error so i downloaded the flashzip files, now every time i turn my WINTEL box its always diagnosing errors like “ACPSI_BOS_ERROR” AND KERNAL errors am able to log in but then it goes back to the blue screen telling me about the error can someone please help me. thanks

  16. hi, my miniPC has died, and cant even get to the BIOS.... The miniPC is with main board CX-W8 rev.1.0 Ill have to write the BIOS with a programmer, but i don`t have the needed file. The mini PC is dual boot system with win8.1 & Adroid if that matters. Can someone provide the bios fail that has to be written, so i can unbrick my miniPC?
    thank you in advance!

  17. Thx Georgy, you saved me the trouble of testing it 🙂 I will stick with Win10 x32 since you confirmed Win10 x64 didn’t work. – cheers

  18. I tried the installation of Win10 x64 before I saw Georgy’s comment.
    Indeed, “ACPI_BIOS_ERROR”…
    Reverted back to 32-Bit BIOS (thanks abbino70!) and installed W10 x32 without any problem.
    Too bad the audio is not working under Linux, because I wanted to use this box as an OpenELEC box :-/

  19. Can anyone upload the 32 bit flasher somewhere? I’ve been trying to download it from that site uploaded but no success.Tym!

  20. Sorry about harassment, but I do not know where to seek help. I have a big problem with my new wintel cx-W8. I need to reset BIOS to default, because I accidentally disabled USB ports in BIOS settings. Now my keyboard and mouse does not work. Please can you give me some instruction for resetting the BIOS? Can you help me with this problem?

  21. I’m afraid you’ll need a chip programmer for that. Disconnecting the battery won’t help.
    The bios is the lower chip (with the orange dot):

    A cheap programmer like the EZP_XPro (AliExpress) is able to reprogram it.

    But if you’re still able to boot windows, and have remote desktop enabled, you can create some startup script to reflash the bios before Windows starts. This lucky trick saved me once 🙂

  22. @GunterO
    Thanks for the informations. I tried to disconect the battery, but it did not help.I have a remote desktop enabled. So, can you tell me which BIOS can I flash to the device?Can you give me the link, please?

  23. I haven’t done this on this particular computer, but I’ll try to help you.

    Because your using Windows, you’ll need to use the default 32-bit bios: M.W8RNNA02.ROM
    You can find the link in one of my previous posts (in
    This zip has only the UEFI flasher inside, so you’ll need a general flasher as well.
    Did some digging, and found one here:

    Good luck!

  24. @Vlad
    > “with 2Gb RAM 64-bit OS will be slower than 32-bit OS”

    Pointers are 2x larger which leads to more cache misses, but on the other hand there are more registers…
    Maybe the right balance is the x32 ABi ( ) that uses the 64-bit mode of the CPU while still using 32 bits pointers for userland apps (but it seems there was little activity on x32 recently…)

  25. @Thanhluutat
    First you need to flash the 64-bit BIOS, then you need to put the OpenElec installer on a UEFI bootable stick (Rufus) and run the installer.
    I have done this and OpenElec works, but no audio (Intel Atom Z3735F is not supported). You could use a cheap USB->Audio converter, but this won’t help if you want the audio on the HDMI …

  26. And what are your tools or advices to clone those babies ? I wanted to make an installation clean, install some softwares and clone everything after, just not to have to re-install everything for the customers, i have 6 mini pc like that and wanted to clone them, i think EMMC is not recognizable by Acronis/Easeus ? Please anybody help

  27. Hello,
    I need some help with my SHOW-TOP Wintel W8. It looks almost the exact same as the Sunchip but I do not have the screen as shown above when pressing esc, instead I just get the BIOS. It is 64-Bit but when I press launch EFI shell it says ‘Not Found!’. Are there any hardware differences with these two devices or are they pretty much the same? I bought my unit off of amazon and my brother managed to erase the boot keys. Any help would be greatly appreciated. Thanks in advance

  28. Hello. I have Bricked Wintel Box…
    Model: cx-w8
    CPU: Atom Z3735F
    OS: Win 8.1
    WiFi: 2.4 GHz
    DDR: 2GB
    Emmc Flash: 32GB

    and question is How to Unbrick it if:
    1. HDMI not give any Video on My TV screen…
    2. USB give Power (Mouse , pendrive, portable HDD have power) but simple normal Cable keyboard not working (no power) but normally working Tested on PC…
    3. Don’t know what version of BIOS is or was installed before…
    4. LED ON BOX:
    a. Led Light in Red for while after plug a power Adapter
    b. Blue led Colour is after pressing ON Button (good sign)
    5. Stupid but tried disconnect BIOS battery for reset CMOS.. :/ No result…
    6. never saw someone who did that but I was Try connect to pc via Micro USB Slot.. :S 😀

    Tried few options “how to unbrick CX-W8” but what can I do w/o keyboard…
    Don’t have any device to re-programme BIOS chip …
    Don’t Have any USB LCD
    Any solution.. Any1 had same problem?
    Any very good spoil “how to do Step by Step” with ScreenShots
    HELP ME 😉 and Others with same or similar problem.. and U will be a hero in My and Otehrs eyes 😀
    Regards, Slaw.

  29. Hmm.. So nobody knows if there is any difference between the W8 Wintel discussed on this thread, and the SHOW-TOP Wintel W8? When I press the ESC key immediately after booting I do not get this graphical screen as shown above, I simply get the Bios. When the option “Launch Internal EFI Shell” is clicked there is no progress.. Just a “NOT FOUND!” error. Please help as I must know if this is fixable or not as this is urgent, for it is my brothers Wintel and I need to know if I should attempt to fix or replace?. More details can be provided but I would appreciate someone’s help please! Thank you very much.

  30. anyone have original BIOS for Wintel Box Model: cx-w8
    BIOS: W8RNAA01

    Jupii.. I get my EZP Xpro from Aliexpress 😀 that’s why writing 2 weeks later.. and…

    BIOS No.1 M.W8RNNA02.ROM
    connected programmer to WINBOND chip and..
    17:57:32 Erase finished!0:49
    18:00:20 program successfully! 8388608 byte(s),0:40
    18:01:00 Verify finished,no error!0:31
    turn ON Wintel Box – LED after plug to power RED for 3 sec then off
    Pressing Power Button – LED colour RED for 10 sec then BLUE for 3 and again… and again…AND AGAIN!!!

    BIOS No.2 M64.W8ANNA01.ROM
    connected programmer EZP Xpro v2…
    18:08:19 Erase finished!0:49
    18:09:10 program successfully! 8388608 byte(s),0:40
    18:09:58 Verify finished,no error!0:30
    same like No.1

    LINK FOR: Bios_wintel.bin!8gARDRjb!WE4U6e2RBotLUgAenI3fIdo2mULLWXgYimAPvoQwNYo
    connected programmer…
    17:34:57 Erase finished!0:49
    17:36:35 program successfully! 3145728 byte(s),0:17
    17:37:12 Verify finished,no error!0:31
    But when I turn ON miniPC – LED have RED colour ALL Time and nothing is working…

    PLEASE comment LINK if some1 can help me.. Thanks.

  31. @Slaw
    Is it the same problem you had before flashing BIOS 1 & 2? If so, it might be another hardware issue.

    Alternatively try to contact your seller to get the BIOS.

  32. today programmed other bios for W8 not CX-W8 name W8_DOS_2.5_3W75_Dual.bin
    after plug power adapter Led is RED 2 sec then Blue 1sec and off
    next after Press Power Button LED Red for 2 sec and then BLUE all time
    HDMI No sign of life…
    USB Ports not give any POWER…

    maybe its not a problem with hardware and need a factory BIOS but idk who is a main developer of it…
    I bought it from a friend..
    maybe somebody have same model of BIOS: W8RNAA01
    Google not even recognize this number.. Just RNA >.<

  33. Yes there is a Label inside on motherboard and its bios w8rnaa01
    System is writed in chinese language..

  34. Q1. Anyone know how can I check if My cx-w8 is designed by sunchip?

    Q2. Anyone know any email to Sunchip and they give answer… because ive send question about BIOS but they not respond…

  35. This forum is not so active…
    It may take years if some more ppl will reply and can help Me with this BIOS.
    Do You know anybody who have cx-w8 and may look at his mobo (maybe same series) then I will be very grateful.
    Regards, Slaw.

  36. Nothing is working now..
    Cant find corect BIOS file and now it is just a piece of $h!+

    File of Bios: W8RNAA01

  37. Update for those who might be interested. Ubuntu on a wintel cx-w8. Yesterday delivered at my house, this little black box. Android and Wintendo 8.1 pro pre installed in dual boot.
    Both worked fine.
    But I want ubuntu on it.
    So I made a usb with ubuntu 16.04. Plugged it in, went into boot manager at startup…but nope.
    Tried it several times, even with ubuntu mate.. but

    Then I applied your bios flash and rebooted. Bingo! Ubuntu installer right away. Installation was very smooth. I decided to do a “entire disk” install and got rid of the other 2 os.

    Now I have a full blown ubuntu running on the 32 gb disk.

    Yet no sound or wifi, but those are not important to me. Will be a client in our office, so I dont need those. Maybe later on will do some tweaking, if i have time.

    Great post. Ubuntu linux on the wintel cx-w8.

    Thanks for sharing your knowledge!

  38. @sensorlife
    When you measure the voltage between the two pins of the power switch in normal operation (when the PC is running), how much is it? If this is very low, a simple capacitor won’t do the trick. In that case you’ll need a circuit with some extra components, but still fairly simple.

  39. Can some tell me if I make a clone of the drive on external hard drive can I have it boot to the external drive from bios?

    I would like to disable the internal hard drive this keeping it cooler and possibly better.

    I keep my wintel 8 elavated and it has not turn of on me since them. I am trying to get xfinity live tv on it to work without minor stutter and I know that SSD is faster then what it has now.

    I do plan on replacing my wintel 8 for wintel 8 Pro it would handle data transmission better. I also plan on disabling built in wifi and have usb 3.0 witless ac adapter.

    What I need to know is if bios has the feature of starting from External SSD.

    Please help


  40. @Angelo Restrepo
    You can re-installed Windows from an external drive, so it can definitely boot from there.
    You can’t just copy the content of the SSD drive to an HDD drive though. You need to install Windows on the hard drive either with Windows 10 + relevant drivers, or the exact Windows 10 firmware for your device.

  41. @burg
    A follow up on my Ubuntu 16.04 on cx-w8. After the first succesful installation of this Ubuntu (see my previous post here), I did order and got 3 more same wintels. Flashed them all and successfully installed Ubuntu 16.04 desktop on 2 and ubuntu server 16.04 on 1 other. 2 boxes I put into my office and the server online for backups. All seemed well.
    But then I got feedback from my staff and I experienced itself on my server. At random, the whole box freezes and only a hard reset (power out and in) will bring him back to life.
    I studied all logs, blacklisted audio modules, but no… still freezes. Sometimes. At random.
    After days of research and trying, I found the solution. Its a kernel problem. The bug was discovered almost 2 years ago and there is still no solution. Read

    The workaround that helps is to add “intel_idle.max_cstate=1” to your grub. I did not have a freeze since 2 days. So far so good.
    Read how to do it on

    Maybe this will help some other people dealing with freezes on this box.

  42. Hello , i have also bricked my Wintel.
    Couple of questions , what is the voltage of the bios chip ? i have ordered a programmer and an 1.8 V adapter .
    Can i reprogram the bios while on the board ? (i have an SOIC8 Clip )
    Can someone upload both 32 and 64 bios dumps ?

    Thanks in advance for your help !

  43. I would like to thank everybody here for continuing to post helpful links. The ability to boot 64-bit would be nice for those OSes that will only boot a UEFI/64-bit combo. Although I don’t want to brick my v3 board so I don’t know if I’m brave enough to try it.

    I also have an original Wintel that seems to be bricked – I’m not sure how (LED comes on briefly then powers off). I had given up on fixing it though, just use the board for sizing when modding the v3 wintel board I bought to replace it.

    Speaking of which, if anybody here might interested I have an Imgur work log of a “fan mod” for rev 3 wintel board:
    I’m not saying it’s a good album or that I’m a great photographer, just saying it’s there. I’m unsure if this mod will eventually fry the board so if anybody wants to replicate do so at your own risk :). I have of course left it running for days at a time: no issues seen thus far.

    And I have noticed a quite noticeable drop in temperatures since the fan mod.

    Also, I have fresh installed windows 10 using the “32/64-bit combo” ISO available from the microsoft web site. If that helps anyone.

  44. Hi everybody,
    Does anybody know why my wintel bios time resets to 2014 whenever the power is cut?!
    Please note that i have replaced the battery twice… but bios time still resets back to 2014…

  45. Hello,

    I have a Wintel W8(Z3735F) and I used it without hdmi. Now when I tried to connect to TV I don’t have hdmi signal.
    I have Teamviewer and everything it is ok with windows 8.1. I can see it in network also.
    Geekbuying says to reset it but I don’t know how.

    Any idea?


  46. I have a cx-w8 3735 which had win 8.1 and android. I did a fresh install of authentic win 8.1 which worked but didn’t work as a media pc for me as hoped. Lately I tried to do a fresh install of android 6 which I was not able to do. Now it only boots to an EFI shell. I have tried multiple bootable usbs with android, windows and repair utilities but I can not get anything to run from this EFI shell. When I type an executable bootx64.efi i get a message unsupported. Any suggestions would be appreciated. Thanks.

  47. Hi, I have a Wintel miniPC W8, and forgot the pass to enter windows10. Is there anyone who can assist me on solving this problem?

  48. Hi, I disabled my HDMI accidentally so my Wintel Pro works but does not output anymore. Is there an way to create reset the bios at all? perhaps bootable USB and flash it?

    1. Open the unit and unplug the battery. Unplug the power cable and with everything unplugged press and hold the power button for 10 seconds. This will reset the bios to default settings and HDMI will be reenabled if its a bios setting problem.

  49. @GunterO Firstly I would like to say a huge thank you, ROM + Flash flies you shared, managed to save my Wintel CX-W8 from the bin after trying to install ubuntu onto it.
    Have you or anyone here, been able to install Ubuntu 32bit onto one of these machines? I’m curious, and tentative about trying again, without knowing if someone else has succeeded first!

  50. Looks like the link to the BIOS (in the original article) gives me a http error code 500. Anyone have a working link to the BIOS?

  51. Hi,
    I have problem with my Wintel W8(win8.1), i was trying to boot from USB to instal Windows 10, and messup with the BIOS a little, so now my keyboard is not recognized on any of the USB and i can’t get in to the MENU page before BIOS(the first image on top), it looks like i’v bricked it somehow.
    i’v tryed resetting the BIOS with holding power button for more than 10 seconds without the battery in, and no result, is there any chance to do something with it ?

    Thanks in advance

  52. Bios acpi error на установки win 64 не возможно из за того что в биосе выставлено скрытно установка систем Linux Ubuntu Android..
    Только можно Ubuntu 64 поставить или Linux 64

  53. Из за этой проблемы не возможно установить Windows x64 и она скрыта..

Leave a Reply

Your email address will not be published. Required fields are marked *

Khadas VIM4 SBC
Khadas VIM4 SBC