BIOS Toshiba PCB G3626A

Hi. On the Toshiba PCB G3626A, I can see four 8pin chip, one with “WINBOND 25Q8OBBL” on it and three that are the same with “25U81A” on them.  Can you tell me which one is the is the PCB BIOS?  Is it necessary to change any of the other chips? Thank you

Please refer the attached photo.

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