I got mine working, but it didn’t make sense why this would need to be done.
1. Format your drive FAT32.
2. Download the latest firmware for the ME1, extract it, and place the ME1 folder
in the root of the USB drive.
3. Stick it in your ME-1 and go.
Without the ME1 folder, the monitor stations kept locking up even though they recognized the USB drive existed.