Good news (bummer re Microcab)
MP1: v 2.01 is the latest/last update.
MP2: v1.41 is the last/latest (makes program changes faster, originally they were a bit sluggish). The version is displayed on the display during the start up. But I'd like you to check the tubes (which requires lifting the lid).
MJMP (and others) can help you trouble shoot the Microcab, hopefully you can get it going
Probably worth clearing the deck and doing factory reset on MP2 (maybe MP1 as well). I've posted a few MP2 patches in the MP2 patches topic, if you use the same patch numbers as I use (bank 11, 0-9) they are above the factory patches. These are dialed up for loud/live but you can turn them down. Dialing up patches at low/bedroom levels, they don't translate to stage volume very well, much better to go the other way.