I'm trying to go back to my OP2 (7.1.1 DU ROM) from my LG G5 (7.0 Stock ROM - Unrooted).
I've tried Helium, and I have backup errors. I've tried ABD, and I have restore errors. I can't backup with Titanium because my LG G5 is not rooted.
What is your preferred method to transfert all data from phone to phone ?