Assuming I did a full backup with
adb backup -system -apk -shared -all -f "backup.ab"
And then went into the recovery on my phone and wiped it completely. Do I need to reinstall the OS before using
adb restore or must I install the OS first?
I ask because I'm in a bit of a bind where I was on the latest CM12 and backed up before attempting and failing to upgrade to CM13. When I try to reinstall CM12, only an earlier snapshot of CM12 is available. If I try to restore with adb after installing the snapshot, com.android.phone fails continuously. I am wondering if the newer CM12 is still in backup.ab.