The client device was being pre-configured, and the original Switch had been upgraded to 2.3x (UTC+8 before 20260917 00:00:00) and had been running for at least half an hour.
However, just before shutting down the device, a device update notification popped up, indicating that S8-PoE could be upgraded from 2.3x to 2.3y. However, no 2.3y update announcement could be found.
The upgrade was ultimately successful.
