Hi Dmitri,
I solved the issue by copying the pad setting to another pad and the recopied back... I think it was something corrupted in the configuration file... I also got a higher quality USB cable, just for safety...
One question regarding firmware update: in MDManager my module is identified as STM32F205RCT6, on the firmware zip file there are megadrumSTM32a_56_20170228 to megadrumSTM32e_56_20170228, (so, letters from A to E) mine looks like an F.... which .bin file should I use? My module is around 6 months old, protected bootloader is included, right?
Thank you for your help!