Is it possible to change the scan rate of the smartfirmware video mode

My Monitor can't display 31 kHz modes (in fact, it doesn't sync below
60kHZ)?

I don't know... but you could try to press one of the F-Keys (AFAICR F5-F8) to change video modies. Dunno if you'll find a modi with 60kHZ... but I have to say that you have a weird monitor then.