A number of messages in this thread had me confused or actively negated each other, but at the time of this writing, on a librem 5 running PureOS byzantium, this is what you should do (and this should be somehow clearly communicated to all librem 5 owners, I think):
- In a terminal, run
cat /proc/cmdlineto find the current version of the uboot bootloader on your device. If the version number starts with 2019, continue to the next step; if it starts with 2022, you don’t have to update. - Run
sudo apt update && sudo apt install u-boot-librem5to install a package that can update the bootloader. - Run
sudo u-boot-install-librem5 /dev/mmcblk0to update the bootloader. - Reboot the phone via the GUI or run
sudo rebootto start the phone using the newly updated bootloader.
No need for manual deb package downloads anymore!