Bricked after tentative BIOS Downgrade

[John Smith]

Maybe a simple NVRAM reset helps. It is described here somewhere in the forum.

If not, you have to use an external programmer to program BIOS EEPROM with the dumped original file (I hope you did it before flashing). Check the EEPROM type on the mainboard, maybe the cheap chinese programmer supports it. The flashing methode described in the Teclast X98 forum here.

[John Smith]

Btw, i think you used the wrong ROM file, i downgraded my V5 with Yepo’s guy jumper.rom file successfully.

[Lorenzo]

John Smith wrote:

Btw, i think you used the wrong ROM file, i downgraded my V5 with Yepo’s guy jumper.rom file successfully.

Nice, I feel even more stupid now! Thanks for the fast reply!

I looked around for an NVRAM reset guide on the forums but I dind’t found much, the only reference was this post which is talking about a similar problem but with another device:

Hello from France.

My TbooK 10 BIOS settings are wrong and I can not boot anymore. I’ve got a black screen with backlight activated but nothing other…

The only solution is to reset NVRAM or BIOS settings, and it seems easy : USB HUB, FAT32 formatted USB-Key with the BIOS file (dump), powering up with keys combinations (Win+ESC or Win+B for InsydeH20 BIOS) and that’s all, the tablet should re-flash the BIOS and boot !

But no-one has got this dump of his BIOS. It seems to be easy to make a backup with the Insyde software on Windows 10.Help would be very appreciated !  Thanks !!

I tried it use the same method but no signs of life!

[John Smith]

EZBook 3 Pro reset BIOS by removing battery (bios one)

Just remove the main battery for few seconds then reinsert. This set the BIOS to fatory defaults. If it is ot help, you need an eyternap programmer with the dumped BIOS file to reprogramm BIOS EEPROM. See how to in Teclast X98 topic, but bevare, the EEPROM is different, Teclast probaly has another chip. Check the 8 pin chip label on the mainboard.

[John Smith]

Mistaped sorry: external programmer I ment.

[Lorenzo]

Removing the battery didn’t change anything, it seems like I fired it somehow, oh well…

Thanks anyway everyone!

[John Smith]

Seems to be yes. Use external programmer to recover. No other options!!! It works, i did many times on Teclast and Onda tablets with 100% success.

[Lorenzo]

John Smith wrote:

Seems to be yes. Use external programmer to recover. No other options!!! It works, i did many times on Teclast and Onda tablets with 100% success.

If I’ll be able to get to the chip and if I’ll be able to recognize it I might try to do it, I’ve no idea on where to start sincerly.

But still, if there’s no other way I might just give it a try! What programmer should I get to start with?

[Author]

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