FM-1 firmware switcher

Keep several firmwares here and write any of them to the FM-1 over USB. Do not unplug the cable while it writes, and do not switch in the middle of a set: it takes a while, and the FM-1 is silent until it is done.

Installing firmware is at your own risk. If an install is interrupted the FM-1 stays in update mode: plug it in again and press Install again to finish. Each firmware keeps its own settings on the FM-1; switching between different firmwares may reset them.