IBM ThinkPad T20 EEPROM crc#1

[recycled]

Hello,

I managed to read and write the RF2408 (thanks to the tools in database). Now I need to know which bytes to change to fix a crc#1 error.
I tried to write the A21e dump to EEPROM, the error is different. It says "wrong rfid serial or crc#2 error" and "set date and time" but it hangs as before.
I tried to write all to zero. Then it hangs before POST in the bootup logo.

Someone knows about it?