This is my father's phone and he went overseas to travel. During his travel he wanted to unlock his phone so he went to some shady area and they apparently rooted his phone but messed up somewhere. They told him to reinstall the firmware and it will be good. Unfortunately that isn't the solution and I have no clue what is the problem.
The mobile networks always has the cross symbol and no option for it exists in the settings. This prevented me from accessing the APN settings, but then after searching for that I managed to get access to it. However, it won't let me create any new APN and there exists none other, giving me the error that this user cannot change the APN settings. No number could be dialed and gives another error that there are no mobile networks. Removing the SIM and trying another SIM does nothing at all.
I then got a firmware from sammobile with the same network as the phone, Koodo 6.0.1 and installed that. The problem still persists and I have run out of ideas and solutions on what to do. Any help would be appreciated.