Hey guys just wanted to let ya know theres a few of you guys that have lost your phone's info including phone number min number and imei aka esn number, due to a currupt ef file.I was talking to shabby and he showed me how to back up my nv just incase it ever happened to me so i wanna share with you guys and give him all the credit. Also if your thinking this wont ever happen to you just ask nuttmeg and a few other on the forum... they had to return their brand new phone to metro's corp store. alright first thing first your gs3 MUST BE Rooted And must have recovery installed after that download terminal emulator which can be found here for free. https://play.google.com/store/apps/...251bGwsMSwxLDMsImphY2twYWwuYW5kcm9pZHRlcm0iXQ.. Once downloaded and installed open it and type this command su then press enter now type reboot nvbackup and press enter again your phone should reboot and back up your important nv file. I really cant stress how important this is to do since it will save you the headache of returning back your phone to corp and wait till they give you another one. For those of you guys that had to return back your gs3 im sorry i didnt ask shabby soon enough but atleast now you guys can make sure it never happens again Edit: shabby forgot to tell me to restore settings its the same command cept instead of nvbackup you type nvrestore so should look like this. Code (Text): u0_a40@android:/ $ su <<< press enter then you get another command line so u enter u0_a40@android:/ # reboot nvrestore That should make your phone reboot and from what mrpnut said it will keep your phone on the samsung splash screen for 30 sec or so then it will enter recovery from which u can restore to any backup and your phone's info number/min number /esn number should be back to normal. Edit Update: Playfulgod has shared an app he created that does this without all the need for the terminal or typing the command im not sure if root is needed for this i dont recall this app asking for root permission but im so used to seeing that i might of not noticed but anyways try it never the less the worst that can happen that it wont do anything lol. Credits to playfulgod for his app: NVBackup&RestoreTool.apk another tut for you guys that are not rooted is using an app that i've recently been using alot and thats Quickshortcut maker which can be found on the play market for free here: https://play.google.com/store/apps/...vbS5zaWthNTI0LmFuZHJvaWQucXVpY2tzaG9ydGN1dCJd anyways once u download it and install it open and navigate to almost the bottom of the list and yes we are searching for activities. Look for sec_ril_dump select it then you should get this screen then just press the try button and you should get this screen. look for nv back up and select it the passcode is 873283 enter and press ok then you should get this last screen saying you saved it successfully Anyways i would like to add a disclaimer not to mess with any other options some require password some dont i would like to find the pass for saving efs data to sd card but cant find anything for that yet. anyways ya been warned ya start playing with settings and screw something up ya are on your own!! like always try this on on your own risk.