Cant Update core or supervisor (from 2021 to 2023)

Hello,

I haven’t dealt with HA for quite a while but now reactivated my PI 3. There’s core on version 2021.2.3 on it. Supervisor is on version 2021.03.6.

I would like to update to the latest version - it won’t let me, though. Core throws an “unkown error - see supervisor”. Supervisor update says: “404 Client Error for http+docker://localhost/v1.40/images/create?tag=2023.11.6&fromImage=homeassistant%2Farmv7-hassio-supervisor: Not Found (“manifest for homeassistant/armv7-hassio-supervisor:2023.11.6 not found: manifest unknown: manifest unknown”)”

Is there a way to still get this to the latest version without losing everything?

Thanks a lot! Appreciate your help!