Thanks Meter 86
Join Date: Dec 2011
Location: Behind your screen...
Perform a search on EFS, EFS backup and restore on S4, and how to restore if you have the EFS backup already. If not, I guess service center is the proper way to go.
SGS4 i9505 Stock 4.2.2 rooted
Domination moded thanks to Vertumus
Xposed moded thanks to Rovo89
Wanam Xposed moded thanks to wanam
Manually debloated by removing 508mb of system apks
Old (& now sold) phone
SGS2 on Ice Cream Sandwich ROM: