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Hm, I never had issues with unit restarting. This seems like HDD issue and the update was written on an area with bad sectors. I'd try a factory reset only.
These are the downloaded Eastern Europe 2020 maps? I have not tested those. Can you rename the file to md5 and then open it as text? Does it show md5 hashes for all the files?
Please check if you have any hidden files in the root of the USB stick. If you used the thumb drive before with any MAC device, there are some hidden files probably there.
If you wish to Install Bulgaria, please install the Eastern European 2020-2 maps. This issue tells you that you have some issues in the folder structure.