Question Identify BIOS chip on motherboard (need to manually flash BIOS)

Jan 27, 2021
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Hello, I wonder can somebody help me locate the BIOS chip on my mobo, I need to attempt a reprogram using a CH341A adapter..

I have pictures here on google drive. First one being upclose of two chips i suspect being the BIOS:
https://drive.google.com/file/d/18NoeO51ly5kvLU6gZKenkdccTFKeSyEE/view?usp=sharing

Second one being the full motherboard:
https://drive.google.com/file/d/1r2UnB1y_E7wfO4FUno9B3JBcPvkOhSaz/view?usp=sharing

Laptop: Asus Tuf A17 - FA706II
Motherboard: DAOBKXMB8D0 REV D / MODEL BKX

Surprisingly little information about the board online, and no schematics to be found.. :(
Thanking you.
 
The chip flagged in upper left appears to me to be a 25LB128....a 128Mb (16MB) serial flash. I found some instructions here on programming one in-situ (a different motherboard, of course). So that looks to be the BIOS EEPROM.

The chip flagged in lower right appears to be 25U8033, an 8 Mb (1MB) CMOS and too small to hold a machine BIOS for modern computers. So that would be the CMOS store for BIOS settings perhaps? Or BIOS for some other on-board device?
 
Last edited:
Jan 27, 2021
8
0
10
0
The chip flagged in upper left appears to me to be a 25LB128....a 128Mb (16MB) serial flash. I found some instructions here on programming one in-situ (a different motherboard, of course). So that looks to be the BIOS EEPROM.

The chip flagged in lower right appears to be 25U8033, an 8 Mb (1MB) CMOS and too small to hold a machine BIOS for modern computers. So that would be the CMOS store for BIOS settings perhaps? Or BIOS for some other on-board device?
Thank you this makes sense! The smaller chip might be related to the GPU settings. I will give it a go with the CH431 method that you mentioned. The laptop is bricked at the moment (no POST / no power LEDs / no screen output) hopefully only due to a corrupt BIOS. :)
 

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