I have to downgrade due to incompatibility with my MAC operating system from the Beta Os 188.8.131.52641 firmware but I can't because when the USB is inserted the writing appears and remains: nanonboot burnFromUSB() ERROR. no USB drive inserted failed to update firmware. Even if I wait 15 minutes nothing happens. The USB stick is formatted FAT-32 and there are no folders but only the kaos.bin file. HELP I don't know what to do anymore because the RIG manager installed on my MAC doesn't communicate with the Kemper. Thanks for your help!