@dos I don't think it's just the battery: yesterday morning the battery was totally discharged and the phone wouldn't switch on, but I did the Recharging Procedure and it started charging — even without the battery; but today that isn't working.
I don't know what those codes mean.
It's quite frustrating that the phone was working fine yesterday but now it's completely broken overnight while it was just sitting charging.
At this point I probably need to accept that I've lost all the unsynced data, and just buy a new phone.
Librem 5 help
@dos Thanks. Yeah, I suspected it would be hardware, and realistically I'm not going to be able to get it fixed. New phone it is!
Thanks for your help!