BIOS Updates forum

Posted: **Tue Jan 14, 2003 4:45 pm**

I have a Winbond W49F002U flash chip (from a dead MSI board) with locked boot block (addresses 3C000 and up cannot be erased - tried with my c't flasher). Does anyone know how to disable this feature?

TIA
(hopefully my post won't be deleted this time... What would be the right section for questions concerning flash chips?)

Posted: **Tue Jan 14, 2003 9:15 pm**

Some chips ignore protection if 12V is put on the VPP/RESET pin. I looked in the datasheet but this chip does not seem to support it. You can try it but be prepared that it can kill the chip.

Posted: **Wed Jan 15, 2003 2:45 pm**

Thanks, Rainbow!
The weird thing about this chip is that in earlier revisions of the datasheet (found rev. A2 here) this 12V trick is described.

Posted: **Fri Jan 31, 2003 12:06 pm**

Tried the 12V trick yesterday. Worked fine

The exact marking of the chip was:
W49F002UP12B
212542901
132OHSA
(i.e. IC revision H, manufactured in 2001, week 32)

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Boot block lockout

Boot block lockout