Default [help] Switched sims, cant root

My brother and I both own D950s from ATT My phone was updated to 4.4.2 through OTA, He started downloading the OTA update but it never actually installed, so under software information his phone is still 4.2.2, I ended up dropping his and broke the little bezzel a little, I felt bad, switched sim cards I now have his old 4.2.2, I thought i'd update it OTA, ATT doens't want to push the OTA cause it says his old phone with my sim card is not registerd, whatever that means. I figured since I can't get it to update OTA i'll just try to root it via ioroot25r1, The batch process hangs up at mounting SU binary etc etc and the phone never reboots into ADB or recovery after toggling usb modes and all that, any insight?