Analogue-sequencer

Hi Jay, 

> When I try to enter the Firmware Upgrade Mode the display 
> never shows what's supposed 
> to come up as illustrated in the manual.
> 
> Most of the time I get one line showing:
> 
> "v3.3 CHK =                "
> 
> and nothing else. The P3 would just freeze right there.
> 
> But the results also vary randomly. Sometimes one line 
> showing "BAD DATA!" would come 
> up straight away. 

This sounds like you must have some corrupt data in the bootloader section
of the flash ROM.
Since it is allowing you to boot normally, the error must be in the firmware
update mode code, rather than the usual boot code.
Drop me a mail privately with your postal address and serial number, and I
can swap out your CPU.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com