Samsung XCover2 phone weird behaviour

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Anyone knows this problem?
Phone has worked flawlessly before. After recharging & startup shows a popup of technical specs (factory specs) and seems factory reseted, everything wiped, asks for software update. No Internet connection (although SIM card OK and I also got a new one to be sure), but I can connect to a network so phone seems to work. Tried also factory reset, no difference, same startup.
In factory reset, it says:
E: failed to mount /efs (invalid argument)
Also noted: SAMSUNG-logo stays much longer

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