Modem stopped working on BH

[Subsentient]

Hey so your situation with the modem suddenly becoming flaky and then stopping working all together sounds exactly like what I experienced. Modem test times out for me as well. I documented my issues and a workaround (atleast for modemmanager) in the thread at: https://forum.pine64.org/showthread.php?tid=9934

I'm curious if you run `screen /dev/ttyS2` can you still issue AT commands? In my situation the USB connections on my BH died completely but the serial /dev/ttyS* devices are still operable. Dmesg prints some stuff on boot related to USB drivers I assume that isn't very pretty as well..

I think this is a hardware issue because it just happened randomly for me (and multiple images show the same issue). Very curious if this issue has been resolved on CE / 1.2 (I hope). Also by the way - my issues happened without any testing on crust / deep sleep; however what I will note is I did (and well... still do) have a habit of pulling the battery out of my pinephone to restart it - which maybe contributed..   but then again most phones can handle this fine.. so this shouldn't break anything on the hardware-level from my perspective.

I've read some of the Quectel code that their engineers sent me. Judging from the quality that I've seen there and in some of their other documentation, it's entirely within reason that they have the modem's filesystem mounted read-write with no failsafes in case of corrupted configuration data. So, it is possible that removing the battery damaged the modem's firmware.