I am on Homeassistant Yellow Hardware and now stuck on HA Core 2025.2.5 because upgrades failed with new versions of HA Core. The rest of the stack is at
Supervisor 2025.04.0
Operating System 15.2
Frontend 20250221.0
My latest try was to update to HA Core 2025.4.3; and it also failed.
Repairs are empty
Supervisor Logs:
2025-04-20 17:59:46.303 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.4.3
2025-04-20 17:59:46.304 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.2.5 to ghcr.io/home-assistant/yellow-homeassistant:2025.4.3
2025-04-20 17:59:46.304 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.4.3.
2025-04-20 18:02:41.394 INFO (SyncWorker_2) [supervisor.docker.manager] Stopping homeassistant application
2025-04-20 18:03:21.591 INFO (SyncWorker_2) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-20 18:03:22.188 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-20 18:03:22.628 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.4.3
2025-04-20 18:03:22.629 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-20 18:03:40.412 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-20 18:03:40.675 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-20 18:03:42.678 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='NOT_RUNNING', offline_db_migration=False)
2025-04-20 18:03:52.707 ERROR (MainThread) [supervisor.homeassistant.core] Home Assistant has crashed!
2025-04-20 18:03:52.708 CRITICAL (MainThread) [supervisor.homeassistant.core] HomeAssistant update failed -> rollback!
2025-04-20 18:03:52.712 INFO (MainThread) [supervisor.homeassistant.core] A backup of the logfile is stored in /config/home-assistant-rollback.log
2025-04-20 18:03:52.712 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.2.5
2025-04-20 18:03:52.713 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.4.3 to ghcr.io/home-assistant/yellow-homeassistant:2025.2.5
2025-04-20 18:03:52.713 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.2.5.
2025-04-20 18:03:53.361 INFO (SyncWorker_0) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-20 18:03:53.529 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-20 18:03:53.917 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.2.5
2025-04-20 18:03:53.918 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-20 18:04:11.942 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-20 18:04:12.160 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-20 18:04:13.979 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='NOT_RUNNING', offline_db_migration=False)
2025-04-20 18:04:55.361 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='RUNNING', offline_db_migration=False)
2025-04-20 18:04:55.361 INFO (MainThread) [supervisor.homeassistant.core] Detect a running Home Assistant instance
2025-04-20 18:04:55.362 INFO (MainThread) [supervisor.homeassistant.core] Successfully started Home Assistant 2025.2.5
2025-04-20 18:04:55.442 INFO (SyncWorker_5) [supervisor.docker.manager] Cleanup images: ['ghcr.io/home-assistant/yellow-homeassistant:2025.4.3']
File mentioned in the log:
[home-assistant loader] a one-liner regarding custom integration HACS being detected and to be sure to disable it, when having problems
So I removed all HACS components and uninstalled the HACS-integration, but the log message persists.
How can I further debug this failure? I am a bit lost.
installing βAdvanced SSH & Web Terminalβ and tinkering with ha comandline toolsβ¦
ha rebuild and installing update via WebFrontend afterwards: failed
ha core check and installing update via WebFrontend afterwards: failed
ha core update: failed
The logs (ha core logs) showed failures of transactions running while the update started (aioshelly: βFatal write error on datagram transportβ, ipp coordinator; Unexpected error fetching ipp data, Runtime Error: Seesion is closed). I regard these errors not being related to the update failure.
β ~ ha supervisor repair
Processing... Done.
Command completed successfully.
(2)
Reboot in webGUI β red button
(3)
ββββ _ _
ββββββββ | | | | ___ _ __ ___ ___
ββββββββββββ | |_| |/ _ \| '_ ` _ \ / _ \
ββββββ ββββββ | _ | (_) | | | | | | __/
ββββββββ ββββββββ |_| |_|\___/|_| |_| |_|\___| _
ββββββββ βββ βββ / \ ___ ___(_)___| |_ __ _ _ __ | |_
ββββββββ ββ βββ / _ \ / __/ __| / __| __/ _` | '_ \| __|
ββ ββ β ββββββ / ___ \\__ \__ \ \__ \ || (_| | | | | |_
βββββ ββ ββββββββ /_/ \_\___/___/_|___/\__\__,_|_| |_|\__|
βββββββ ββββββββ
Welcome to the Home Assistant command line.
System information
IPv4 addresses for end0: 192.168.1.201/24
IPv6 addresses for end0: 2003:f8:[...]/64, fd00:571c:102e:ffff:f251:e135:b2dd:e0f7/64, fe80::9ae:7402:3b78:9d96/64
OS Version: Home Assistant OS 15.2
Home Assistant Core: 2025.2.5
Home Assistant URL: http://homeassistant.local:8123
Observer URL: http://homeassistant.local:4357
β ~ ha core update
Processing... Done.
Command completed successfully.
[refreshing the WebUI still revealed Version 2025.2.5]
β ~ ha core update --log-level debug
DEBU[0000] Adding homedir to searchpath homedir=/root
INFO[0000] No configfile found
DEBU[0000] Debug flags apiToken=d2[..]50 cfgFile= endpoint=supervisor logLevel=debug noProgress=false rawJSON=false
DEBU[0000] core update args="[]"
DEBU[0000] [GenerateURI] base=supervisor command=update section=core
DEBU[0000] [GenerateURI] Result uri="http://supervisor/core/update" url="http://supervisor/core/update" url(string)="http://supervisor/core/update"
β£½ Processing... DEBU[0316] Response body="{\"result\":\"ok\",\"data\":{}}" fields.time=5m16.628023269s headers="map[Content-Length:[25] Content-Type:[application/json; charset=utf-8] Date:[Thu, 24 Apr 2025 08:30:06 GMT] Server:[Python/3.13 aiohttp/3.11.16]]" received-at="2025-04-24 10:30:06.445849327 +0200 CEST m=+316.632403993" request="&{POST http://supervisor/core/update HTTP/1.1 1 1 map[Accept:[application/json] Authorization:[Bearer d2[...]50] User-Agent:[go-resty/2.16.5 (https://github.com/go-resty/resty)]] <nil> <nil> 0 [] false supervisor map[] map[] <nil> map[] <nil> <nil> <nil> {{}} <nil> [] map[]}" status="200 OK" statuscode=200
Processing... Done.
Command completed successfully.
β ~ ha supervisor logs
2025-04-24 10:16:15.400 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:16:16.773 INFO (MainThread) [supervisor.homeassistant.api] Updated Home Assistant API token
2025-04-24 10:16:16.807 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='NOT_RUNNING', offline_db_migration=False)
2025-04-24 10:16:47.300 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='STARTING', offline_db_migration=False)
2025-04-24 10:16:52.361 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='RUNNING', offline_db_migration=False)
2025-04-24 10:16:52.361 INFO (MainThread) [supervisor.homeassistant.core] Detect a running Home Assistant instance
2025-04-24 10:16:52.361 INFO (MainThread) [supervisor.addons.manager] Phase 'application' starting 1 add-ons
2025-04-24 10:16:53.005 INFO (MainThread) [supervisor.docker.addon] Starting Docker add-on homeassistant/aarch64-addon-configurator with version 5.8.0
2025-04-24 10:17:17.799 INFO (MainThread) [supervisor.api.middleware.security] /network/info access from a0d7b954_ssh
2025-04-24 10:17:17.806 INFO (MainThread) [supervisor.api.middleware.security] /network/info access from a0d7b954_ssh
2025-04-24 10:17:17.812 INFO (MainThread) [supervisor.api.middleware.security] /host/info access from a0d7b954_ssh
2025-04-24 10:17:17.821 INFO (MainThread) [supervisor.api.middleware.security] /core/info access from a0d7b954_ssh
2025-04-24 10:17:23.256 INFO (MainThread) [supervisor.misc.tasks] All core tasks are scheduled
2025-04-24 10:17:23.257 INFO (MainThread) [supervisor.host.info] Updating local host information
2025-04-24 10:17:23.260 INFO (MainThread) [supervisor.updater] Fetching update data from https://version.home-assistant.io/stable.json
2025-04-24 10:17:23.262 INFO (MainThread) [supervisor.resolution.check] Starting system checks with state running
2025-04-24 10:17:23.263 INFO (MainThread) [supervisor.resolution.checks.base] Run check for multiple_data_disks/system
2025-04-24 10:17:23.263 INFO (MainThread) [supervisor.resolution.checks.base] Run check for no_current_backup/system
2025-04-24 10:17:23.264 INFO (MainThread) [supervisor.resolution.module] Create new suggestion create_full_backup - system / None
2025-04-24 10:17:23.264 INFO (MainThread) [supervisor.resolution.module] Create new issue no_current_backup - system / None
2025-04-24 10:17:23.265 INFO (MainThread) [supervisor.resolution.checks.base] Run check for free_space/system
2025-04-24 10:17:23.273 INFO (MainThread) [supervisor.resolution.checks.base] Run check for docker_config/system
2025-04-24 10:17:23.274 INFO (MainThread) [supervisor.resolution.checks.base] Run check for pwned/addon
2025-04-24 10:17:23.283 INFO (MainThread) [supervisor.core] Supervisor is up and running
2025-04-24 10:17:23.428 INFO (MainThread) [supervisor.resolution.checks.base] Run check for disabled_data_disk/system
2025-04-24 10:17:23.428 INFO (MainThread) [supervisor.resolution.checks.base] Run check for ipv4_connection_problem/system
2025-04-24 10:17:23.429 INFO (MainThread) [supervisor.resolution.checks.base] Run check for trust/supervisor
2025-04-24 10:17:23.452 INFO (MainThread) [supervisor.resolution.checks.base] Run check for dns_server_ipv6_error/dns_server
2025-04-24 10:17:23.485 INFO (MainThread) [supervisor.resolution.checks.base] Run check for dns_server_failed/dns_server
2025-04-24 10:17:23.498 INFO (MainThread) [supervisor.resolution.checks.base] Run check for security/core
2025-04-24 10:17:23.498 INFO (MainThread) [supervisor.resolution.check] System checks complete
2025-04-24 10:17:23.498 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-24 10:17:23.914 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:17:23.915 INFO (MainThread) [supervisor.resolution.fixup] Starting system autofix at state running
2025-04-24 10:17:23.915 INFO (MainThread) [supervisor.resolution.fixup] System autofix complete
2025-04-24 10:17:24.206 INFO (MainThread) [supervisor.host.services] Updating service information
2025-04-24 10:17:24.219 INFO (MainThread) [supervisor.host.network] Updating local network information
2025-04-24 10:17:24.586 INFO (MainThread) [supervisor.host.sound] Updating PulseAudio information
2025-04-24 10:17:24.599 INFO (MainThread) [supervisor.host.manager] Host information reload completed
2025-04-24 10:17:53.694 INFO (MainThread) [supervisor.api.middleware.security] /core/update access from a0d7b954_ssh
2025-04-24 10:17:53.720 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.4.3
2025-04-24 10:17:53.722 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.2.5 to ghcr.io/home-assistant/yellow-homeassistant:2025.4.3
2025-04-24 10:17:53.722 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.4.3.
2025-04-24 10:20:49.246 INFO (SyncWorker_1) [supervisor.docker.manager] Stopping homeassistant application
2025-04-24 10:21:29.308 INFO (SyncWorker_1) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-24 10:21:29.906 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-24 10:21:30.324 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.4.3
2025-04-24 10:21:30.324 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-24 10:21:48.056 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-24 10:21:48.443 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:21:50.542 ERROR (MainThread) [supervisor.homeassistant.api] Error on call http://172.30.32.1:8123/api/core/state: Cannot connect to host 172.30.32.1:8123 ssl:False [Connect call failed ('172.30.32.1', 8123)]
2025-04-24 10:21:55.554 ERROR (MainThread) [supervisor.homeassistant.core] Home Assistant has crashed!
2025-04-24 10:21:55.555 CRITICAL (MainThread) [supervisor.homeassistant.core] HomeAssistant update failed -> rollback!
2025-04-24 10:21:55.555 INFO (MainThread) [supervisor.resolution.module] Create new issue update_rollback - core / None
2025-04-24 10:21:55.559 INFO (MainThread) [supervisor.homeassistant.core] A backup of the logfile is stored in /config/home-assistant-rollback.log
2025-04-24 10:21:55.559 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.2.5
2025-04-24 10:21:55.560 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.4.3 to ghcr.io/home-assistant/yellow-homeassistant:2025.2.5
2025-04-24 10:21:55.560 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.2.5.
2025-04-24 10:21:56.225 INFO (SyncWorker_2) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-24 10:21:56.393 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-24 10:21:56.790 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.2.5
2025-04-24 10:21:56.790 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-24 10:22:14.713 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-24 10:22:14.923 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:22:16.848 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='NOT_RUNNING', offline_db_migration=False)
2025-04-24 10:23:02.341 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='RUNNING', offline_db_migration=False)
2025-04-24 10:23:02.341 INFO (MainThread) [supervisor.homeassistant.core] Detect a running Home Assistant instance
2025-04-24 10:23:02.342 INFO (MainThread) [supervisor.homeassistant.core] Successfully started Home Assistant 2025.2.5
2025-04-24 10:23:02.435 INFO (SyncWorker_7) [supervisor.docker.manager] Cleanup images: ['ghcr.io/home-assistant/yellow-homeassistant:2025.4.3']
2025-04-24 10:24:49.820 INFO (MainThread) [supervisor.api.middleware.security] /core/update access from a0d7b954_ssh
2025-04-24 10:24:49.848 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.4.3
2025-04-24 10:24:49.849 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.2.5 to ghcr.io/home-assistant/yellow-homeassistant:2025.4.3
2025-04-24 10:24:49.849 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.4.3.
2025-04-24 10:27:44.235 INFO (SyncWorker_3) [supervisor.docker.manager] Stopping homeassistant application
2025-04-24 10:28:24.165 INFO (SyncWorker_3) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-24 10:28:24.626 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-24 10:28:25.037 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.4.3
2025-04-24 10:28:25.038 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-24 10:28:42.895 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-24 10:28:43.304 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:28:45.425 ERROR (MainThread) [supervisor.homeassistant.api] Error on call http://172.30.32.1:8123/api/core/state: Cannot connect to host 172.30.32.1:8123 ssl:False [Connect call failed ('172.30.32.1', 8123)]
2025-04-24 10:28:50.439 ERROR (MainThread) [supervisor.homeassistant.core] Home Assistant has crashed!
2025-04-24 10:28:50.440 CRITICAL (MainThread) [supervisor.homeassistant.core] HomeAssistant update failed -> rollback!
2025-04-24 10:28:50.443 INFO (MainThread) [supervisor.homeassistant.core] A backup of the logfile is stored in /config/home-assistant-rollback.log
2025-04-24 10:28:50.443 INFO (MainThread) [supervisor.homeassistant.core] Updating Home Assistant to version 2025.2.5
2025-04-24 10:28:50.444 INFO (MainThread) [supervisor.docker.interface] Updating image ghcr.io/home-assistant/yellow-homeassistant:2025.4.3 to ghcr.io/home-assistant/yellow-homeassistant:2025.2.5
2025-04-24 10:28:50.444 INFO (MainThread) [supervisor.docker.interface] Downloading docker image ghcr.io/home-assistant/yellow-homeassistant with tag 2025.2.5.
2025-04-24 10:28:51.158 INFO (SyncWorker_4) [supervisor.docker.manager] Cleaning homeassistant application
2025-04-24 10:28:51.322 INFO (MainThread) [supervisor.homeassistant.module] Update pulse/client.config: /data/tmp/homeassistant_pulse
2025-04-24 10:28:51.710 INFO (MainThread) [supervisor.docker.homeassistant] Starting Home Assistant ghcr.io/home-assistant/yellow-homeassistant with version 2025.2.5
2025-04-24 10:28:51.711 INFO (MainThread) [supervisor.homeassistant.core] Wait until Home Assistant is ready
2025-04-24 10:29:09.722 INFO (MainThread) [supervisor.resolution.evaluate] Starting system evaluation with state running
2025-04-24 10:29:09.937 INFO (MainThread) [supervisor.resolution.evaluate] System evaluation complete
2025-04-24 10:29:11.777 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='NOT_RUNNING', offline_db_migration=False)
2025-04-24 10:29:57.143 INFO (MainThread) [supervisor.homeassistant.core] Home Assistant Core state changed to APIState(core_state='RUNNING', offline_db_migration=False)
2025-04-24 10:29:57.143 INFO (MainThread) [supervisor.homeassistant.core] Detect a running Home Assistant instance
2025-04-24 10:29:57.144 INFO (MainThread) [supervisor.homeassistant.core] Successfully started Home Assistant 2025.2.5
2025-04-24 10:29:57.215 INFO (SyncWorker_0) [supervisor.docker.manager] Cleanup images: ['ghcr.io/home-assistant/yellow-homeassistant:2025.4.3']
2025-04-24 10:46:34.673 INFO (MainThread) [supervisor.homeassistant.api] Updated Home Assistant API token
2025-04-24 11:07:08.929 INFO (MainThread) [supervisor.api.middleware.security] /supervisor/logs access from a0d7b954_ssh
β ~ cat /config/home-assistant-rollback.log
2025-04-24 10:28:39.486 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration hacs which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
The update consistently fails with this error being logged.
2025-04-24 10:21:50.542 ERROR (MainThread) [supervisor.homeassistant.api] Error on call http://172.30.32.1:8123/api/core/state: Cannot connect to host 172.30.32.1:8123 ssl:False [Connect call failed (β172.30.32.1β, 8123)]
2025-04-24 10:21:55.554 ERROR (MainThread) [supervisor.homeassistant.core] Home Assistant has crashed!
2025-04-24 10:21:55.555 CRITICAL (MainThread) [supervisor.homeassistant.core] HomeAssistant update failed β rollback!
Is there something else I can scrape during the boot process of the core container?
β ~ ha os datadisk list
devices: []
disks: []
β ~ ha os info
board: yellow
boot: A
boot_slots:
A:
state: booted
status: good
version: "15.2"
B:
state: inactive
status: good
version: null
data_disk: CT500P3SSD8-2302E69C0B3C
update_available: false
version: "15.2"
version_latest: "15.2"
the inconsistent display of the datadisk. A NVMe drive is installed as in ha os info, but ha os datadisk does not seem to know.
β ~ ha os datadisk wipe
This will completely wipe the datadisk. This process is irreversible.
Are you sure you want to proceed? [enter YES to confirm] YES
ERRO[0002] API did not return a JSON response. Status code 403
API did not return a JSON response. Status code 403
So I ripped the NVMe disk out of the Yellow, formatted it with gnome-disk-utility (ext4) put it back, plugged in the USB stick with the Yellow installer and somehow managed in a couple of trials to push the right buttons.
I have a fresh install feeling right now.
Itβs gonna be interesting what will happen, when I reinstall the backup.
So I could not upload the backup. eMMC storage was too small (canβt remember the error message, but it had nothing to do with available space).
The fast lane is: temporarily configure the installation, move the data partition, wait for reboot, upload the backup again (three dots on the top right corner) and start the restore process.
For my own surprise I immediately found the encryption key!
07:35:39 [D] [sensor:093]
'nous-plug-server-079637 - Electric Consumption [kWh]': Sending state 0.53065 kWh with 3 decimals of accuracy
07:35:40 [E] [api:129]
No client connected to API. Rebooting...
07:35:40 [I] [app:125]
Forcing a reboot...
The restore took about 10 hrs (telling from energy data started to being recorded this morning).
I had to revert the network configuration back to a static IPv4, to keep the Shelly devices happy (CoIoT protocol). But now everything seems to be functional again.
Now I am on latest (as of yesterday) HA Core and hesitate to push the βUpdateβ-Buttonβ¦