Default can't mount /efs


I have somehow managed to make me tablet unusable. I do not get any wifi or lte connectivity (SIM is not read correctly).

I tried to flash via odin and using kies emergency firmware recovery. While not flashing the custom recovery, entering the "original" recovery throws this error: E: failed to mount /efs (Invalid argument)

Could someone please help me restore it? (maybe you can take a backup of yours?)

I have a p605 16Gb LTE