Network problem on Android Pie - Onyx

Hello !
I currently have a Oneplus X with an unofficial build of LineageOS 16.0 (Android 9)
The problem i have is that i can't manually change the mobile network
I live in between France and Germany and i want to connect to the french network, but i'm currently
stuck on the German network (Roaming mode with bad data connection)
Now I want to disable automatic selection of networks but it prompts me with : "couldn't find networks. Try again"
I tried everything even wiping + updating the rom still stuck.
I suspect that there is a file somewhere that sets the native network as the german one,
if someone could tell me which one is it, so i can edit it.
Thanks !

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