imei repair for mt6260 watch

i have the zgpax s88 gps watch.
i get invalid imei on the screen.
i tried to use the – sn write tool to burn the imei to the device with no success.
i thinks that i have to get the correct cfg file for this cpu-mt6260.
please try to point me to the correct tool or the correct cfg file,this watch is useless now.
thanks a lot for everyone.