Same issue with 2.1.3. Thx OP for your efforts and time.
Nothing installs at all? What device and rom?yes, nothing installs...![]()
I flashed 6.0.1 as a new secondary rom and booted up and restored apps. I rebooted to recovery and flashed ViPER|Atmos 2.1.3 Dark and everything was flashed. I set up v4a and got it processing after disabling and enabling speaker tab. I then opened Dolby Atmos and changed eq to open to get it processing. I then booted to recovery and flashed ViPER|Atmos 2.1.4 Dark which only removes the mount /data lines from 2.1.3, and I may have wiped Dalvik and Cache afterwards before rebooting. Everything was still intact like nothing had changed.
I'm going to test my son's Nexus 5 and 2013 7 now.