Potential problems with patching latest Navcore 21.2 and MDC

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Try to boot your device somewhere it can't get signal, and see if it loads the map.
Normally there's a problem with some devices that they freeze when they get signal, and if that's happening when you boot it, it won't get past the black screen.
If it boots, go to settings and restore the device. This worked for me on a GO 600 that had the freezing problem (desperation measure).
Oh, if it doesn't show anything on the screen after it reboots, wait about 30 seconds, put it to sleep (don't turn it off), and turn it back on. It will then let you choose the language and other settings.

If that doesn't work, restore your backup and try to install the patch this way:
1. Connect it to MCD and delete all the maps from internal memory (use the delete option or, if that doesn't work, try to install a map bigger than the internal memory and then choose to delete maps from the internal memory).
2. Reboot the device with the magic card inserted
3. Enable ADB and Root
4. Reboot device
5. Copy packages
6. Upload meta
7. Reboot device
8. Install maps and speedcams
9. Reboot device

I've done it this way in a couple of devices and had no problems.

@minhangre
Thanks for responses
I will try your way Maby Maby will work

Inside (no Gps signal) was everything perfect.
Got outside to try it.. It was not passing that black screen...

Next try is the one mentioned by u... Finger crossed

installed last 22.xxxx from mdc deleted all internal maps fully working now

thanks

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OMG it's realy working i do it with navcore 21.200.0003.311 from MDC, delete map in intenal Memory
and patch it with MSTMS-Nav4-Navcore22.100

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Hello!
when i have delete the map in the intenal memory the voice are delete too, so how can i add them without returning to MDC ?

remove the patch with nav4free.bat, in menu 6) Advanced Operations, 5) Remove the Patch.
with deleted patch connect MDC Install map, check on the device that you do not have the sound disabled, if you still do not voices, in MDC check voices look those that give error if you persist uninstall voice that do not work and install again, if you remain without a voice I could be sotware problem.
if you have solved it you can already install patch and radars or what you want.
regards