Unbricking a Hi12…(don't try dual boot yet) :S

[spzjulien supercowz]

same for me process fail at. 80%
bios is not good for all it seem

flashed original single os bios with hardware flasher, seem not want too boot too …

[TWICE]

indeed. troublesome bios

[Chris G]

Whoa, close, so close. I was about to flash mine. Good thing I read this, sorry about the bricks. I’ve done it countless times now. Okay so Chuwi is correct, it can’t be flash, some hardware changes I guess is the problem. You’ll need to find the original Win 10 model bios and flash it with a USB programmer to recover the bricked Hi12.

This guide will help, it’s essentially the same, just use the Cube H12 bios file

EPROM in the CHuwi Hi12 is a 1.8v Winbond 25Q64V, so select WINBOND W25Q64 in CH341A, but be careful the USB flashers are for 3.3v chips use a logic level converter.

http://techtablets.com/forum/topic/dual-os-version-announced/page/2/#post-27702

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[emily]

Hello,

Chuwi Hi12 has two version for single OS and Dualboot.

 

If you are single OS (Windows Only), please download official files from Chuwi Official Forum:

http://forum.chuwi.com/thread-167-1-1.html ( for firmware and driver)

http://forum.chuwi.com/thread-277-1-1.html (for Bios X64 and Camera Driver for cannot recording)

 

If you are dualboot with windows10 and android 5.1 , please download official files from Chuwi Official Forum:

http://forum.chuwi.com/thread-1160-1-1.html

 

 

[GBAM]

HI all;

is there any method to turn a single boot chuwi h12 (I only have win 10)  into a dual boot one?

does flashing a dual boot firmware do the job? Thanks.

[Richard Russell]

GBAM wrote:

HI all; is there any method to turn a single boot chuwi h12 (I only have win 10) into a dual boot one? does flashing a dual boot firmware do the job? Thanks.

No, the closest thing is installing phoenix OS, but WiFi doesn’t work

[Robert A]

I’m also in the same boat with a bricked Hi12

I ordered a programmer and a sop8 clip, I was too impatient for the 1.8v adapter to come and figured hearing of other people’s success, I thought I’d try without it.

So, everything went smoothly. It detected the chip just fine with the right model number everything. Flashed it with the battery wires desoldered. Flash verified to be the same as the bin file.

Touch the battery wires back (without soldering, and they measured 6.3v), try to power on, and nothing.

Retried with the older dual boot firmware, same thing. Bios chip reads and verifies great.

I can’t figure it out. Surely it wouldn’t verify correctly or even be subsequently readable if there was a problem after flashing.

 

Any ideas?

[Bill Christiansen]

That 6.3v is a strange voltage for battery. On my dual boot version the batteries are in parallel so 3.7v flat or 4.2v charged. When it was over discharged while I was waiting for my tools to flash bios the battery got down to 3.3v and needed a good charge to boot even after reprogramming chip.

The chip is definitely 1.8v and although it may verify when programmed at 3.3v it may be damaged and not work at normal frequency.

[Author]

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