LG L70 D320N Does not recognize SIM, what to do?

[AC Question]

Since I have rebooted my LG L70 it doesn't recognize my SIM. I have tried factory reset but that doesn't work. I have also tried to reinstall Android but when I want to do so (either through the PC or in the phone through an update) it either stalls or reports that my device is not registered.

Does anyone know what to do??