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I had the same issue, but it did allow me ot create a new APN. Although it takes you back to the standard EE one once its been saved, which is confusing. However, it then lets you select the new one and you can make it default.

I would like to install the standard firmware. However, there is no option to do this, is there any guidance on doing this?

@BruCom Glad I convinced you we are all facing the same issue shared by both LTE5398 and LTE5388… and most certainly some others (I noticed a few other messages in forums which seem describe a similar unwanted behaviour).

@BruCom @RobTheNetworkGuy Did you also noticed that any existing TCP connection established was still working? This means that the IPv4 stack is still working, pretty strange. I'm out of home for a few more days and cannot test, but I wonder if ICMP would work

Some LTE providers internaly "block" connections after 12 or 24 hours to avoid permanent users. In these situations, users have to disconect and reconnect to fix this. And in the mean time, LTE seems to be established and existing connections are kept (only new TCP is blocked). I wonder if it could be something like this which happens to us. Anyway, the IP monitoring watchdog would detect and fix it easily.

Sorry, duplicated post