samsung i9505 imei null

hello members
i have samsung i9505 no network problem. i check imei show null and baseband ok. i repair imei but show error. how to solve this problem thanksss.

Waiting ADB device… OK
Reading phone info…
Model: GT-I9505
Android version: 4.4.2
Product code:
Phone version:
PDA version: I9505ZHUFNB3
CSC version: I9500ZCUGNF1
CSC country code: China
CSC sales code: TGY
HW version:
Phone S/N:
Modem board:
RF cal date:
Initialization AT RIL… error
Done with Samsung Tool PRO v.25.4