Analogue-sequencer

"Ah, that would mean the new bootloader was loaded as if it were a main
program - so your bootloader will still be the old version.
That would explain why it doesn't like the current build - the syx file has
the official ID, which the 3.0 bootloader doesn't support.
 
I'm pretty confident the sysex ID patch for 3.0 will get you running again.
That be the last bootloader update too.

Cheers,
Colin f"

Success! 

Thanks muchly,
Gene