Tried to start over with fresh RPi installation, failing miserably

Hey guys, I’ve been running my RPi3B & SSD for about a year with only minor issues. After updating to OS 4.15 (from 4.11) my system became unstable so I decided to start over with a fresh 4.11 OS and then restore from my Google backup.

I’ve now been trying for hours… both using my RPi3 & SSD and a RPi4 with SD card. The results are exactly the same, at the logon prompt my backup can’t be restored (tried five different ones). Also, when I create a user and try to install the Samba addon it isn’t there. This is recorded in the log:

20-11-12 13:17:52 INFO (MainThread) [supervisor.hassos] Detect HassOS 4.11 / BootSlot A
20-11-12 13:17:52 INFO (MainThread) [supervisor.store.git] Clone add-on https://github.com/hassio-addons/repository repository

20-11-12 13:17:52 INFO (MainThread) [supervisor.store.git] Clone add-on https://github.com/home-assistant/hassio-addons repository

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/core/ssh/config.json: does not match regular expression @ data[‘map’][5]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/core/configurator/config.json: does not match regular expression @ data[‘map’][2]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/core/check_config/config.json: does not match regular expression @ data[‘map’][2]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/core/samba/config.json: does not match regular expression @ data[‘map’][5]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/node-red/config.json: does not match regular expression @ data[‘map’][1]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/ssh/config.json: does not match regular expression @ data[‘map’][3]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/motioneye/config.json: does not match regular expression @ data[‘map’][0]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/ftp/config.json: does not match regular expression @ data[‘map’][3]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/vscode/config.json: does not match regular expression @ data[‘map’][3]. Got ‘media:rw’

20-11-12 13:17:59 WARNING (MainThread) [supervisor.store.data] Can’t read /data/addons/git/a0d7b954/plex/config.json: does not match regular expression @ data[‘map’][0]. Got ‘media:rw’

20-11-12 13:17:59 INFO (MainThread) [supervisor.store] Load add-ons from store: 56 all - 56 new - 0 remove

20-11-12 13:18:00 INFO (SyncWorker_5) [supervisor.docker.interface] Pull image homeassistant/armv7-hassio-supervisor tag None.

20-11-12 13:18:01 ERROR (SyncWorker_5) [supervisor.docker.interface] Can’t install homeassistant/armv7-hassio-supervisor:None -> 404 Client Error: Not Found (“manifest for homeassistant/armv7-hassio-supervisor:None not found: manifest unknown: manifest unknown”).

20-11-12 13:18:01 ERROR (MainThread) [supervisor.supervisor] Update of Supervisor fails!

20-11-12 13:18:01 CRITICAL (MainThread) [supervisor.core] Can’t update supervisor! This will break some Add-ons or affect future version of Home Assistant!

This also happens with OS 4.15 and 4.16, not only the 4.11 so my system is completely dead now.
Have tried writing the images on different computers using different Balena Etcher versions but since there are no error messages during installation I don’t think that’s the issue here.

Would really appreciate if someone could help!

An update… I tried the 5.5 development build and was able to restore my backup at the login prompt without issues. Is there something going on with the 4.xx images?