I can only advice and also offer you new unlock menu with iGO Primo 2.4 which is great alternative for original Mio navigation. Unlock menu works completely from SD card, therefore you won't need to modify any files on the internal flash disk.
[Only registered and activated users can see links. ]
unpack and copy all 4 folders to a SD card. Reset your Mio and it should boot into a new menu..
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