GT-I8200n NVM Damaged ? Any Help

hi 😉 i have GT-I8200N after flash CSC for Languge change
the phone Stuck at Samsung logo:(
so i flashed with stock rom 🙂
after that the Imei null/Null :confused:

tried to imei repair but without sucsses here is the log :

Operation: Repair
Selected model: GT-I8200N
Software version: 24.2

Waiting ADB device… OK
Reading phone info…
Model: GT-I8200N
Android version: 4.2.2
Product code: Unknown
Phone version: I8200NXXUANG1
PDA version: I8200NXXUANG1
CSC version: I8200NOXAANG1
CSC country code: Germany
CSC sales code: DBT
HW version: Unknown
Phone S/N: 00000000000
Modem board:
RF cal date: Unknown
Checking Super user right… true
Bypass MSL… error (1)
NVM damaged:eek:
Done with Samsung Tool PRO v.24.2:confused: