Engenius ENS1750 not upgrading

I have an EnGenius ENS1750 currently running 24.10.2. I’m trying to upgrade to 24.10.5 via sysupgrade (CLI and LuCI). The upgrade starts without errors, but after the reboot, the AP comes up with the old version; no upgrade applied.

I’m a bit lost as to where to start, so I would appreciate any hints or help.