Samsung G925-F repair - Emergency calls only

Hi everyone,

Few months ago, I bought a new Samsung Galaxy S6 EDGE sealed, nobrand, simfree from a shop here in Italy
After few weeks the phoned stop working only in the telephonic part (Emergency calls only - Not registered on the network) because the Italian operator Postemobile blacklisted the IMEI code for theft
(Evidently the phone had got outlaw origin and the shop cheated me; the IMEI results as blacklisted)

I brought back the phone to the shop and they, without giving me any advice, rooted the phone and changed the IMEI code, to make the phone work again
I got the phone back working, keeping android5, with root, different IMEI and different kernel (called "S6_UniBase_NOg8_v2 glthedingo # 1")
At the moment, the electronic IMEI code of the phone is different from the one wrote on the box

The phone kept working since, when Android 6 went out, I wanted to update the phone (the phone couldn't be uploaded with root) and to remove the root
I flashed the Android 6.0.2 firmware with Odin3; the updating was successful
Since the moment i updated to Android6, the phone stopped working with the telephone part (Emergency calls only - Not registered on the network)
One minute before i did the update telephone calls were working and after the update telephone calls didn't work anymore

I can't understand why the telephone stopped working
(Maybe the changing of IMEI code need any modifications to work and updating the phone i lost these modifications)

- How can I get phone calls work again?

Thanks

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