Android SDK for the ADB tools or Terminal in your phone. Root explorer for copying files to and from EFS folder PS: I restored my phone's firmware to it's original PDA, Phone and CSC, rooted it with CF-Root, and then done this procedures below nv_data " file is the thing that I need to fix the IMEI is that they share a very look alike name, and they have the same 2MB size. One thing that led me to the conclusion that ". so I experimented and after some hours, I fixed my IMEI. searched all the forums and didn't find anything that could cure my phone's IMEI and set it to the original IMEI number. I flashed my phone with some ROMs, and I didn't backup my EFS folder before, then My SGS2 IMEI was changed to 004999010640000, and we know this is the fake IMEI that is assigned to the phone if the nv_data.bin file is messed up. NOTE THAT AT LEAST YOU MUST HAVE THE SHIPPED ORIGINAL EFS FOLDER ON YOUR PHONE ( even if you didn't make a backup of it yet and even it's messed up ) FOR THIS METHOD TO WORK If you did not make any backup of your EFS folder, and your IMEI is messed up, this could be your solution to recover your lost IMEI.
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