s7562 imei repair issue

i m trying to repair s7562 imei..all is ok via z3x tool...imei successfully repaired but after some minuts its again null..can some one help for this..?



Selected model: S7562

Selected port: COM94 SAMSUNG Mobile USB Serial Port

Selected port speed: 115200

Reading phone info...

PDA/CSC version: S7562XXBMG2/S7562OJVALH3

Phone version: SW VERSION :None

Phone HW: MP 0.600

Cal date: 2013.07.28

Searching ADB device... OK

Reading phone info...

Model: GT-S7562

Android version: 4.0.4

Product code: GT-S7562UWAINS

Phone version: S7562DDBMG1

PDA version: S7562XXBMG2

CSC version: S7562OJVALH3

IMEI: null

Phone S/N: RZ1D755CQQL

Checking Super user right... true

Reading data from phone... OK

Writing data to phone... OK

Rebooting phone... OK

Checking phone at COM94

Reading phone info...

PDA/CSC version: S7562XXBMG2/none

Phone version: SW VERSION :None

Phone HW: MP 0.600

Cal date: 2013.07.28

Repairing Master IMEI... OK

Repairing Slave IMEI... OK

Reseting... OK

Done with Samsung Tool v.16.9

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