Another problem 
I have a Maytech remote E surf and RX1 TX1 Telemtrie from 75100 connected. Everything has worked. Display of V and A is really helpful.
Now I got me from Flipsky the bluetooth module, connected to RX2 TX2 and already the engine jerks ;-(.
BLT works, telemetry also, but so it is not drivable.
Then I disconnected the telemtrie RX1 and TX1 and then the engine ran again. BLT provides data and the controller can also be programmed.
But now it becomes curious! If I now pull off the BLT and make again the telemetry to RX1 and TX1 ran, the engine still jerks. If I make everything off everything goes again. Ok, then I thought I just make Batt+ for the V dran. But that alone is now already enough that the engine jerks.
I have made another post with the 6374 FOC problem, can it even be that the receiver is the problem?
something like that really costs you hours!
Have already ordered a new receiver and will report.
olli