First of all, thanks to Arturia for still supporting the Microbute.
I was, however, expecting some new LFO features (single-cycle saw, s+h, stationary wave, monopolar...). Besides, the only new feature is somehing I don't know what it is. Any clues about the Midi Stop handling? I've tried MIDI MMC but doesn't seem to work.
Regarding the LFO, as avantronica has previously said, the LFO LED is off at the beginning of the cycle only when it runs free. This is strange and confusing and could be easily fixed, I presume.
About the version related issue, my MicroBrute says it's the 1.0.4.0 version. I believe this is correct because when I ask it with a General Information Identity Request that is the version it returns. (See the last four bytes before the ending byte.)
$ amidi -p hw:1,0,0 -S 'F0 7E 7F 06 01 F7' -d
F0 7E 01 06 02 00 20 6B 04 00 02 01 01 00 04 00 F7