Change Midi Chanel

[mouseman]

Hello and have a nice Sunday.
I have a small question about one of your products and would appreciate a little help.
It is about the simple MIDI Interrupter with firmware version 1.6.5.
I am owner of 2 such devices and would like to reprogram one to MIDI channel 1 and the other to MIDI channel 2.
Unfortunately I am not very good at programming and would need a little hint where in the code to define the midi channel, then I can recompile and reload.