When flashing the bootloader compiled from the github repo, it is not possible to enter calibration mode since the bootloader takes over instead.
The error is in line 187 of peaks/bootloader/bootloader.cc
bool exit_updater = !switches.pressed_immediate(1);
bool exit_updater = !switches.pressed_immediate(2);
I also wanted to thank you for the countless hours of joy I experience playing with your creations. It makes my inner child come out and take over.