SPO Firmware + USB MIDI

Save it on the SD card with a name like "SPOUSB.bin," and you will be able to load it from the code>flash menu.
The same applies to the EMY, Mea, Kaiwa, Sino & Vax firmware so that you can switch from one to another within the main menu.

This function copies the firmware to "firmware.bin" and reboots the system.

It will delete the firmware.bin but keep the original firmware on the card with its name.

If you are changing the add-on board like VAX, Robovox, Kaiwa,  etc ..: install the new firmware first from the flash menu, wait for the calibration screen and switch it off.

Next, add the add-on board, apply power, and complete calibration.