I've adjusted https://wiki.debian.org/Librem5 I didn't know how to do a list in the wiki, so the three files (u-boot, image, etc) look a bit weird currently :P
With the latest librem5-flash-image > 0.0.3 from contrib (iirc @agx has filed an unblock request for it to migrate to testing) it should be reasonably straight forwarding flashing your own images
@agx @devrtz
Ah yes thanks, Debian wiki fixed.