how to update bios ezb3pro v4 to v5

[John Smith]

Arrgh, remove pls that terrible green dot from the BIOS chip, i can not see the chip type.

[vicen]

John Smith wrote:

Arrgh, remove pls that terrible green dot from the BIOS chip, i can not see the chip type.

I can not, that picture is not mine… sorry

[Juha Pirinen]

I have somewhere good pictures from my ezbook motherboard… I’ll try to find.

Maybe it’s 25LB64: https://techtablets.com/forum/topic/hi13-bios-chip/

[John Smith]

My V5 original was JUMPER10x.P8.WP313P.NhNAUHL02, Date: 11/06/2017 (locked, evolation copy), downgraded to JUMPER10x.P8.WP313R.NHNAUHN02, Date: 08/07/2017 (Jumper.rom file from Yepo’s guy Google drive).  As i said i only used at command prompt: <span style=”font-weight: 400;”>AfuEfix64.efi jumper.rom /P /B. So programmed NOT the whole EEPROM, just the Boot Block and Main Block!!! (Did it via UEFI shell, after dumping the original content too).</span>

[vicen]

John Smith wrote:

25LB64

i think this is a little bit risky and i do not understand very well what steps you follow…maybe you could elaborate a bit

thank you in advantage

[John Smith]

It is NOT the BIOS chip. Try to locate Winbond W25Q64FW, or something like that. Many tablets has that EEPROM,  this EEPROM possible to program with the famous and cheap CH341A programmer, BUT only with 3.3V to 1.8V adapter!!!!!

[John Smith]

This 25LB could be the EC BIOS, not the main.

[Juha Pirinen]

Here:

 

https://www.dropbox.com/s/qo1cir22ql0jksj/IMG_20180116_210022.jpg?dl=0

 

https://www.dropbox.com/s/4st2tu1ewwkv9yn/IMG_20180116_210310.jpg?dl=0

 

Opened up my own laptop.

 

EDIT: OK, try to find winbond…

[Juha Pirinen]

Maybe this one? 25Q80C

 

And with some googling…

Datasheet: http://www.chinan-sx.com/uploadfile/cfile/2010119111110143.pdf

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[John Smith]

Yes, right! There is a whole for easy access on the black plastic plate.  So 25Q80C, it is a 3.3V chip.

[vicen]

John Smith wrote:

Yes, right! There is a whole for easy access on the black plastic plate. So 25Q80C, it is a 3.3V chip.

so, the CH341A should work ?? no adapter needed? maybe a ic clamp?

[John Smith]

This programmer supports:

https://www.ebay.com/itm/CH341A-Series-24-EEPROM-Writer-25-SPI-routing-BIOS-LCD-Flash-USB-Programmer/331573047065?hash=item4d334b2f19:g:VvQAAOSwLF1X45aS

Use 1.18 programming software with w7. I do not know about w10 support, i am using it with w7.

[John Smith]

It is 3.3V chip, programmer is OK without 1.8V adapter. Clamp is useless, it is not a DIP chip, you have to do outwireing.

[vicen]

John Smith wrote:

It is 3.3V chip, programmer is OK without 1.8V adapter. Clamp is useless, it is not a DIP chip, you have to do outwireing.

thank you very much, is nice to know that there is a solution if i fuck up downgrading…

[Juha Pirinen]

Well, that is cheap!

I work daily with electronics so this is kind of a piece of cake. We do have eprommers at work but those are quite old, over 10 years or so.

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