Mobile network only 2G. Diagnostics?

Thanks @hennsch and @Valorsoguerriero97
I will try to find the energy and focus to reflash the phone. I don’t have much of either these days.

I’m currently downloading Sailfish_OS-Jolla-4.5.0.24-h3113-1.0.0.14.zip - could you point me to the instructions on finding an android image and flash it?