Unfortunately unlock menu which you are trying to use cannot work on your Mio, because it's not properly coded for this Mio type! And that's the reason you are stuck on the welcome screen. Mio 7700 gets commands in boot sequence from \My Flash Disk\Program Files\Navman\appstartupsec.ini file which is clearly missing in the unlock. Can you still connect device with the PC so you can see it's flash disk? If so, than It's not a big problem. If not, than the only way to un-brick it is from SD script.
Also please check MioMore app, there should be backed up files from your device if you really did a backup. You can manually search it, most probably is stored somewhere in My Documents folder..Or check Miomore settings where you can usually set path for a backup folder..If you find it, please send me a file device.xml which is located in the Flash disk root. From that file I can create SD version of the unlock which will solve the problem.
later edit:
I think I got the file so this SD unlock should do the trick:
Spoiler:
unrar, and copy folders Magnetic_S5000, Progs and slide to empty fat32 formatted SD card. Restart device with the SD card. It should boot into a new ulock menu. Report back.
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