Samsung S6 G920f Imei turn to 3500000000006 after some time[HELP]

I Unlock this May 23, 2015

After a few days customer came back to me and the S6 have a only show emergency call only

please tell how to fix this


This is the nv_data.bin back up


[ 5/23/2015 7:27:00 PM ] Operation: Unlock
[ 5/23/2015 7:28:00 PM ] Selected model: SM-G920F
[ 5/23/2015 7:28:00 PM ] Software version: 21.1
[ 5/23/2015 7:28:00 PM ]
[ 5/23/2015 7:28:00 PM ] Waiting ADB device...
[ 5/23/2015 7:28:00 PM ] Please, allow USB debugging on phone... OK
[ 5/23/2015 7:28:00 PM ] Reading phone info...
[ 5/23/2015 7:28:00 PM ] Model: SM-G920F
[ 5/23/2015 7:28:00 PM ] Android version: 5.0.2
[ 5/23/2015 7:28:00 PM ] Product code: SM-G920FZDAITV
[ 5/23/2015 7:28:00 PM ] Phone version: G920FXXU1AOCW
[ 5/23/2015 7:28:00 PM ] PDA version: G920FXXU1AOCV
[ 5/23/2015 7:28:00 PM ] CSC version: G920FITV1AOCN
[ 5/23/2015 7:28:00 PM ] CSC country code: ITALY
[ 5/23/2015 7:28:00 PM ] CSC sales code: ITV
[ 5/23/2015 7:28:00 PM ] HW version: MP 0.800
[ 5/23/2015 7:28:00 PM ] Phone S/N: RF8G4198MCF
[ 5/23/2015 7:28:00 PM ] Modem board: SHANNON333
[ 5/23/2015 7:28:00 PM ] RF cal date: 20150416
[ 5/23/2015 7:28:00 PM ] IMEI:
[ 5/23/2015 7:28:00 PM ] Checking Super user right... true
[ 5/23/2015 7:28:00 PM ] Reading nv data... OK
[ 5/23/2015 7:28:00 PM ] Checking magic... OK
[ 5/23/2015 7:28:00 PM ] Initialization AT RIL... OK
[ 5/23/2015 7:28:00 PM ] Sending request to server... OK
[ 5/23/2015 7:28:00 PM ] Waiting answer... OK
[ 5/23/2015 7:28:00 PM ] Calculating... OK
[ 5/23/2015 7:29:00 PM ] Writing nv data... OK
[ 5/23/2015 7:29:00 PM ] Rebooting phone... OK
[ 5/23/2015 7:29:00 PM ] Unlock done