Panasonic FZ-M1 Series Operating Instructions - Reference Manual page 131

7. Touch [Exit] menu, and then double-touch the commercially available optical drive or USB storage device in "Boot Override" .
The computer will restart.
8. Touch [Erase].
9. Touch [Erase the all data on the whole Disk.].
10. Touch [Start Erase Process.].
Erasing the flash memory drive data starts.
11. After the erasing is completed, remove the Recovery Disc and touch [Shutdown.].
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