M-400: SYMPTOM: Unable to Update the Operating System
The most common reasons an update is unsuccessful are:
The downloaded update file has not been extracted (unzipped).
The "m400_sys_v2321" folder or the "m400_sys_v2321.zip" unzipped file was transferred to the USB memory. Only the "M-400.PRG" update itself should be transferred onto USB drive.
The "M-400.PRG" update file was not place in the root directory of the USB memory.
If the problem continues:
Try formatting the USB memory in the M-400 prior to updating the console: SETUP-->SYSTEM-->F6(USB MEMORY)-->F1(FORMAT).
Perform a speed test for the USB memory to be sure that it's functioning properly with the M-400: Press SETUP --> F6 (USB MEMORY) --> F7 (SPEED TEST).