Yes you can, but it could be pain in the a*s sometimes. I can see that you play with the paths.xml file or some other essential system file(s)
I'll try to help you with potentially easiest solution first (unlock/mortscript via SD card).
1. Download --> [Only registered and activated users can see links. ]
2. Extract and copy all 3 folders ( Cobia_410_64, progs, slide) to a blank SD card (fat32 formatted). Reset device.
Report back!
edit: I can see you are already flirting with the ROM files for your device, but that is the last possible solution - only if all other attempts fails..That' because reinstalling ROM, involves disassembling your Mio as you need to make a short-circuit on pin9 on a main chip which gives you access to service menu. Only from that service menu you can eventually reinstall software/ROM from the SD card.
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