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Firstly reinstalling the firmware won't help like that, you're better off doing a *#7370#, or at boot, doing holding the power button, the 3 key, and the *, to restore factory defaults.
Secondly, v12.0.0.13 is the latest version, there are guides around here about how to update is NSU says v11 is the latest, have a read of them and see if you want to go down that route...
The general consensus is that things work much better if you don't restore things from back are doing a full wipe, it's better to manually reinstall.
By the way, that problems were you having that made you do this in the first place?
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