

Absolutely avoid using a Mac's format tool because it's almost sure to result in an unsuitable format.

Avoid using Windows built-in format tool (might or might not work so don't risk it).

*Many users state that the method of formatting is preferable because it's completely compatible with the proprietary Garmin OS. Remember that when your device is cured you can restore most of the missing files by running WebUpdater or GarminExpress. If removing files doesn’t help, or you’ve accidentally formatted the flash drive into NTFS or done an incompatible FAT format (See info re RMPrepUSB below), or its filesystem is corrupted then you should reformat the flash drive into FAT or FAT32 (only much older MSM devices use FAT, newer devices use FAT32).Start from those files that were created/copied last. If the filesystem on the flash drive is OK then you should try removing/renaming some files that could cause problems.It should enter the mass storage mode and the PC should detect it as a new flash drive. Don’t disconnect your device from the PC.Once MSM is re-enabled corrupt files can be removed or as a last resort a proper re-format done, see below*.

Please note that the CURE firmware cannot boot the device, it can only allow the device to enter Mass Storage Mode and connect to PC.
