[Q] Jiayu G4S won't call after update - Android Q&A, Help & Troubleshooting

Hi there,
About a half year ago i got my Jiayu G4S, 16gb, octacore. Works great, but it comes with stock Android 4.2.2.
So a few weeks ago i decided to update the G4S with the official Android 4.4.2 Jiayu G4S update rom I found on needrom.com.
So i flashed it and booted the G4S, everything works fine, except for the mobile network.
I can't call anymore and the G4S won't connect to a my mobile-phone provider...
It shows some mobile network signal from now and then but that's it.
Could it be possible that the phone is on an different network setting or something, that it might switched from Europe to China?
I tried a lot of thing, with a lot of different roms, but i just won't work anymore.
Am i the only one wit h this problem? I've searched the internet for weeks now, but without any luck so far.
Kind regards,
Dicky

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