i9505 imei write AT RIL ERROR


hii guys here my log

Operation: Repair
Selected model: GT-I9505
Selected port: COM3 SAMSUNG Mobile USB Serial Port ,
Software version: 20.5

Waiting ADB device… OK
Reading phone info…
Model: GT-I9505
Android version: 4.4.2
Product code:
Phone version:
PDA version: I9505XXUGNG8
CSC version: I9505ITVGNG1
CSC country code: ITALY
CSC sales code: ITV
HW version:
Phone S/N:
Modem board:
RF cal date:
IMEI:
Initialization AT RIL… error

Done with Samsung Tool v.20.5

i tried many times same error what i wrong? how can i solve this? Thx a lot

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