manual microcode update

Bought a Celereon 347 cpu for old Asus p5s800-vm that I got.
The thing is that this cpu is not officialy supported by the motherboard (while 346 cpu is supported).
The cpu works and all, But I get an "intel cpu Ucode loading error" in the bios screen just before boot, and then i get an annoying "F1 to continue" message.

Is there an manual update I can do (Already installed latest bios), that will once and for all update the cpu microcode, Or it something that is done on every restart basis ?

Thanks :O)

Disable F1 on errors if you have an option for that.

Thanks CeeBee.
Should anything else needed taken care into consideration ? or can it work forever this way ?
Tempratures are excellent and computer seems to work flawlessly

No, the manufacturer would have to come up with a new BIOS..

I guess the end of the world willcome before that, Since it's quite an old motherboard....