BIOS Lock up

[ali-ayam]

I have a P33G v1.0 PC-Chips mainboard with P4 631 and winXP pro 32-bit.
It tooks a long time (10 minutes or more) to boot, but it can go all the way to Windows. And after upgrading BIOS to the latest version in the manufacturer website, it can't boot anymore. An error message "CMOS Setting Wrong, Date and Time not set. Press F1 to resume". Changing BIOS setting seems to be not working, since after F10 (saving) it comes back at that message again and again. Any suggestion?

 

[ali-ayam]

I replaced the battery. Still, "CMOS Checksum Bad. Date/Time Not Set. Press F1 to enter SETUP". Any changes I made in BIOS seems has no effect (changes are not saved even after Save and Exit), and after rebooting it shows that message again and again. I'm sure I used the right BIOS, so what did I do wrong?

 

[ali-ayam]

In some Award BIOS there's a choice to Load Standard CMOS and Continue (Usually by F2). Are there any other way to bypass CMOS Checksum? Since all hardware fastly detected in BIOS, but no changes can be saved... It used AMI BIOS