Don't want to bash OP, but my antivirus blared like a police dog smelling cocaine as soon as I clicked on the link and try to download, AND after I've finished downloading. Also, most, if not all of these so-called "tweaks" have been either debunk...
Aluminum with Spigen Rugged Armor and dbrand mahogany wood skin
EDIT: Titanium nexus logo with colored X
Lol the 6P hater is back. I never meant bad thing against you by the way, just slightly annoyed at the way you trashed the 6P and praised your oh so precious S7.
I would suggest try cleaning dalvik and cache. However, I don't think that that would solve the red warning screen. Perhaps the backup you restored was somehow corrupted. I'd say reflash everything (bootloader, radio, rom, vendor, etc), and return...