This update is only compatible with the latest current hardware revision of the SFC-Mini V3. Never update an older model with this firmware!!
NEVER UNPLUG THE CONTROLLER OR CLOSE THE PROGRAMMER UNTIL YOU ARE POSITIVE THE UPDATE PROCESS IS DONE. The process is fully finished when the updater app says “Done!”. UPDATES ARE AT YOUR OWN RISK, BRICKED CONTROLLERS CAN BE SENT BACK FOR REPAIR. That being said this is the process I am using to program the controller during development (using command line instructions) and it’s running perfectly, just don’t break the process when it’s busy and you will be fine.