Hello I have succesfully (guess so, at least MIOS Studio claims so) uploaded MIOS, but when trying to upload midio 128.syx either with sysexbox or MIDI-OX I don't get any response from core and obviously the PIC didn't get the program. I have core set with preburned bootloader ver 1.2 from SmashTV and the only exception from the kit is that my optocoupler is 6N137 instead of 6N138. When troubleshooting the module with sw_loopback_test's main.hex I got many meaningless messages into MIDI-OX's input monitor but couldn't verify midi feedback loop within MIDI-OX; on the other hand, MIDI-Out port on core module seems to be working when uploading the MIOS. . . Any ideas, how to proceed with troubleshooting? best regards Jussi