edison-image-80e1125f.7z contains a 64 bit image in ext4 and btrfs, ready for flashing with the supplied flashall.sh (flashall.bat has not been updated, we will accept patches for that). Once you flash the btrfs image you can send btrfs 'snapshots' containing a 2nd image. edison-image-edison.snapshot.7z has an example of that. See https://edison-fw.github.io/meta-intel-edison/6.2-Transferring-a-new-btrfs-image.html
For a Debian Bullseye 11.5 image see Honister64 This can also be installed as a 2nd image.
Release notes: https://edison-fw.github.io/meta-intel-edison/0.6-News.html