95 quid an hour for programming!! He'd probably just do what I'd do. Copy the ram, flash the tills roms and then send the ram down again! I'll pm you with options.
Pity I can't verify what he says about your rom being unable to print bills properly.
P.s. I meant dollars not pounds.

The tech said update for eprom would give the option to Print bill and the eprom that I have it can't.