samsung s4 imei unkown issue

I have samsung s4 sgh-i337m
And it’s showing unkown IMEI
I tried to repair imei using z3x samsung tool pro but no success

And this message comes up

Waiting ADB device… OK
Reading phone info…
Model: SGH-I337M
Android version: 5.0.1
Product code:
Phone version:
PDA version: I337MVLUGOH1
CSC version: I337MOYAGOH1
CSC country code: Canada
CSC sales code: FMC
HW version:
Phone S/N:
Modem board:
RF cal date:
Initialization AT RIL… error