Hi Aman,
You can upgrade it to recommend release which match with your hardware platform, but please read the release note before the upgrade in case any probability known issue.
https://www.extremenetworks.com/extreme-hardwaresoftware-compatibility-...
Hi Aman,
Yes, there are some open issues and known Behaviors. you can check the release note for this firmware from below link.
https://documentation.extremenetworks.com/release_notes/ExtremeXOS/16.2.4-Patch1-5/EXOS_Release_Note...
Hi,
Below link include the most stable release and last feature release for your device.
https://www.extremenetworks.com/extreme-hardwaresoftware-compatibility-recommendation-matrices/softw...
Yes, Extreme UPM feature similar with smartport macros.
https://documentation.extremenetworks.com/exos_22.4/EXOS_21_1/Universal_Port/universal-port.shtml