After upgrading to byzantium and installing some packages, at reboot my phone only reaches the state, where the cursor blinks in the upper left corner. It does not log in, like in normal boot sequences.
I can’t connect via USB console, even though the phone establishes a usb serial device (/dev/ttyACM0). Connecting a keyboard via a USB dock also did not elicit a reaction at this point.
Is there a way to talk to the phone in that state, other than reflashing the device?
Is there a way to boot from a USB drive?
Did anyone play around with u-boot already? On a Pi 4 it is possible to configure u-boot to offer a console at startup, so in principle it should also work on the Librem 5. I already figured out how to build u-boot. I just remember that it’s not straight forward to configure u-boot. It took a couple of iterations to make it work on the Pi 4.