Hello @JohnyKun ,
UID LED should flash if followed below steps to Factory default:
Two types of Reset:
The Reset button (pictured in the preceding illustration) is used to restore Factory Default settings, or reset the switch while it is powered on.
• Resetting the Switch — Press and release the button. This action clears any temporary error conditions that may have occurred and executes the switch self test.
• Restoring Factory Default &onȴJuratLon — Press and hold down for over 5 seconds, the switch will then complete its self test and begin operating with its configuration restored to the factory default settings. Any configuration changes you may have made through the web browser interface are removed.
NOTE: When restoring to factory defaults,after pressing and holding the Reset push button for 5 or more seconds, the UID LED will begin flashing.
Thanks!