Update

I fixed it with a restore of a backup on a new USB device and deleted all partitions via console on the SSD first.

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I just upgraded to 7.3.1 and installed an SSD before doing so to migrate the system to the SSD after the update. While going through the process I encountered this error:

➜ Starting configuration...
➜ Starting internal boot setup. This might take a while...
➜ Configuring internal boot pool...
✗ Internal boot setup returned an error: assignableDisks snapshot: [{"id":"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T","serialNum":"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T","device":"/dev/nvme0n1"}] assignableDisks resolved serialNum->device: [["Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T",{"bootId":"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T","devicePath":"/dev/nvme0n1"}]] Running: emcmd debug=cmdCreatePool,cmdAssignDisk,cmdMakeBootable Running: emcmd cmdCreatePool=apply&poolName=boot&poolSlots=1 mkbootpool: command failed or timed out emcmd request failed with status 500
Technical details

{
  "request": {
    "operation": "CreateInternalBootPool",
    "variables": {
      "poolName": "boot",
      "devices": [
        "Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T"
      ],
      "bootSizeMiB": 0,
      "updateBios": true,
      "reboot": false
    }
  },
  "response": {
    "ok": false,
    "code": 1,
    "output": "assignableDisks snapshot: [{\"id\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"serialNum\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"device\":\"/dev/nvme0n1\"}]\nassignableDisks resolved serialNum->device: [[\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",{\"bootId\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"devicePath\":\"/dev/nvme0n1\"}]]\nRunning: emcmd debug=cmdCreatePool,cmdAssignDisk,cmdMakeBootable\nRunning: emcmd cmdCreatePool=apply&poolName=boot&poolSlots=1\nmkbootpool: command ...[truncated]"
  },
  "status": 1,
  "error": {
    "name": "Error",
    "code": 1,
    "message": "Internal boot setup returned ok=false",
    "category": "unknown",
    "networkError": {
      "status": 1,
      "result": {
        "ok": false,
        "code": 1,
        "output": "assignableDisks snapshot: [{\"id\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"serialNum\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"device\":\"/dev/nvme0n1\"}]\nassignableDisks resolved serialNum->device: [[\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",{\"bootId\":\"Samsung_SSD_970_EVO_Plus_500GB_S4EVNJ0N234529T\",\"devicePath\":\"/dev/nvme0n1\"}]]\nRunning: emcmd debug=cmdCreatePool,cmdAssignDisk,cmdMakeBootable\nRunning: emcmd cmdCreatePool=apply&poolName=boot&poolSlots=1\nmkbootpool: command ...[truncated]"
      }
    }
  }
}

➜ Updating Server Identity to NAS...
✓ Server Identity updated.
➜ Finalizing setup...

I didn't reboot yet, I think the system will not be able to start if I do it. Help is appreciated.

Edited June 5Jun 5 by Vexz

Please post the diagnsotics.

You probably missed my edit of the OP, right at the top. I fixed it and everything is working fine now.