Aopen DE-945CD

Aopen DE-945 CD (reported as i945GMx-BCD/CD R1.04)
BIOS version R1.04
http://global.aopen.com/userdownload_Lis...Model=2607
(link to global download)

I've re-flashed this BIOS to my MB but it will not save settings to CMOS. Basically, all I need is for it to stay in AHCI mode but still be able to go back to IDE if needed. I've checked/removed the battery to no avail, sometimes it will save for a couple reboots but often won't save settings at all.

thanks,