With the upgrade to xkeyboard-config 2.37 in postmarketOS, it is not possible to type in numbers and other symbols on the N900's hardware keyboard. As a result, the 20221027-0119 edge image is unusable out of the box, since you cannot enter the default password (147147), nor can you ssh in (disabled in official images).
A WIP fix is available in pma!3596. Until new images are shipped containing the fix, it is advised that after writing the image to the SD card, you mount it in Linux, then overwrite the contents of /usr/share/X11/xkb/symbols/nokia_vndr/rx-51 with the contents of this file, ensuring the file name remains rx-51 in the SD card.
Related issue: pma#1775
MR with fix: pma!3596
Upstream MR and discussion : fdo gitlab