Hi:
I would imagine you definitely have a dc7800.
I have one, and my BIOS is v1.32 like yours.
The highest is v1.32 and can be found at the dc7800 support page at link below (Windows 7).
Yes, you are out of luck if you wanted to flash the BIOS to a previous version.
You can also go into the BIOS and look at the system information screen and it will tell you what model PC you have.
You may also want to see this related post about the memory error.