Hello Bjoern,
I finally got time to try out my BTS. When I looked at the LMT I was confused about the "MBCCU0: No Load" which seems to be the TRX0 ?
Probably this is a similar problem I have with my BS-11, when turning on the cold BS-11 the first time, frequently the firmware load for TRX0 fails. Most certainly this comes from a hardware problem (maybe aged capacitors ?).
I have to restart (turn off and on) the BS-11 a few times till it works. If the unit has warmed up, I never saw this problem till now.
I also made the experience that it could help if no LMT cable (serial cable) is attached so I usually try it this way: Turn the BS-11 on without the LMT cable plugged in (at the BS-11 side) and after a while (around 5 to 10 minutes) check if the firmware for TRX0 is loading or is already loaded. If it fails, unplug the LMT cable, turn the BS-11 off and try again. I am not really sure about the effect of the LMT cable, but maybe the cable receives noise.
Best regards, Dieter