OG RAZR, stock OTA ROM from the original Jellybean roll-out, rooted. Last night downloaded Voodoo Rootkeeper, did a su backup, then temp un-rooted. Let the new 98.72.165.XT912 upgrade install, then restored the root with Voodoo and all appears fine. I still have root. I'll test out wifi-tether_root later but mutiple apps (Ti Backup, Voodoo, Root Checker basic, supersu) all say I have root.