Hey, I got the "cellular update failed" a few days ago.

I´ve tried every troubleshooting step possible, from updating to ios 14.6, checking if the SIM is working, airplane mode and even restoring it to factory settings. Unfortunately, this last step really f?cked up the situation as now I can´t even move forward from the Hello page, as it says that the iphone "cannot be activated" and that it needs an update, iTunes doesn´t let me check it either.

Any idea how to fix it?