Dang the only thing that I thought would have worked was NV_read/write but you tried that......if you go to sammobile and go to unlock a device and pick your phone they have a option for imei repair, that's the only thing I would think that would help
Sent from my ATT Samsung Galaxy SIII using TapaTalk
If i helped hit the thanks button.
Current Device: Samsung Galaxy SIII (SGH-I747)
ROM: Stock Touchwiz Rom
Kernel: Stock 3.0.31-2024954
Previous Devices: Motorola Droid 1, Pantech Crossover, Motorola Droid X, LG Revolution, Sony Ericsson Xperia Play (r800x)