OK,
I did it all from the top using the DS2202 as a base in the FW patch
The model number remained at DS2022 with the DS2A000...1 S/N
I update to the latest firmware
I applied the DSGH code (for fun of course!)
And voila it works!!
The Model comes out as DS2302
The S/N remains mangled at DS2A0000000001
I have all the installed options
The minimum time base is now at 1ns.
Most importantly, I no longer have options (most of which I don't need) counting down annoyingly.
The only down side is that my S/N is wrong and I can no longer take a screen shot with Ultra Sigma.
The thing I haven't tried yet is doing the S/N repair set to a DS2072. When I did it as a 2102 and 2202 there were issues.
Thanks Anders and Alan for your help,
Regards, Stuart