Lenovo T430u - which chip to flash?

[ktmmotocross]

Hello
Have this Lenovo t430u with no post.
Found three bios chips, so im confused which one to flash.
Also if somebody have good dumps it will be great to post it

there are two 4MB ic and one 8MB ic

[piernov]

Re: Lenovo T430u - which chip to flash?

https://www.badcaps.net/forum/showthread.php?t=61665

[ktmmotocross]

Re: Lenovo T430u - which chip to flash?

i read that but still dont know what do other two 4BM ic. EC bios and what is second one for?

and on my board u19 and u23 is 4MB and u20 is 8MB

MB is rev.F

[SMDFlea]

Re: Lenovo T430u - which chip to flash?

U19 is the EC for the ITE i/o . U20 and U23 are dual SPI,the bios is split across the 2 chips.

[piernov]

Re: Lenovo T430u - which chip to flash?

U19 is a 4Mb (=512kB) flash. Contains EC firmware.
U20 is a 64Mb (=8MB) flash. Contains ME Region.
U23 is a 32Mb (=4MB) flash. Contains main BIOS.

[ktmmotocross]

Re: Lenovo T430u - which chip to flash?

ME region is bigger than main bios?

flashed U20 and got picture

[SMDFlea]

Re: Lenovo T430u - which chip to flash?

I`m as confused as the schematic

[piernov]

Re: Lenovo T430u - which chip to flash?

Yes this ME region is the "5MB SKU" one. It doesn't fit in a 4MB flash.
The label "32Mbit (4M byte)" is clearly wrong on the schematics. It happens…

[SMDFlea]

Re: Lenovo T430u - which chip to flash?

Yeah, it happens more than once in this schematic. 2 X 8MB