When i flashed a new bios and reboot, the system gives me the choiche to press F1 for setup or F2 to continue. When i choose F1 and change some settings, then choose save and exit, the settings are not saved?
It seems you have skipped a step,
1. (Update BIOS and/or) Clear CMOS.
2. BIOS Complains about invalid checksum, Press F1 to enter BIOS.
3. ***then always load first optimal default settings<----***
4. Change your settings and save and exit.