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Hi - I just upgraded the BIOS on my perfectly working PC with the 'critical' upgrade, flashing from F.06 to F.20 and Win 7 Pro no longer boots. I receive the BSOD and error:
STOP: 0x000000A5 ... The bios in this system is not fully ACPI compliant. ...
Have tried the following solutions/checks:
1. Reflashed the BIOS to F.20 in FreeDOS using erompaq.exe, which executed succesfully and still the same error.
2. Tried to downflash the BIOS back to F.06 in FreeDOS, but this failed. Previously, I have been able to downgrade from F.08 (??) to F.06 but the 'enhanced security' on F.20 may be stopping this.
3. Removed hard disk and deleted hiberfile.sys and pagefile.sys, reinstalled but no difference.
4. Run Windows memory check, which reported no errors.
5. Booted in BIOS modes inc. IDE mode // default mode // security off // network interfaces disabled -> no change
Any suggestions? I have a brick that is out of warranty, all because of HP!! I can think of the following solutions, but would appreciate if anybody could advise:
a. Flash back to F.06 -> but how can this be forced to overwrite F.20, as erompaq fails to write??
b. Force flash with uniflash -> risky.. and is it supported?
c. Install Win 7 iso on USB to hopefully repair the installation -> not guaranteeed.
d. modify Windows 7 installation via external mounting. are there any files or mods which can bypass the check?
e. Upgrade to Win 8 DP, hope it works -> not guaranteed.
f. Reinstall entire OS, hope it works -> time consuming, not guaranteed.
My preferred solution is (a), and basically revert back to what was fine in the first place! 
Thanks for your help
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HP Mini 5102 (1.66 GHz, 2GB RAM, 1366x768)
Win 7 Professional SP1
