Hi all, I found this thread here but it got locked (I assume due to someone's naughty language and inability to be civil):

https://community.tp-link.com/en/business/forum/topic/587358?page=1

I am having pretty much the same issue - my switch fails when trying to ugprade to 5.0.3

I run my own software controller (latest version, just set it up a couple weeks ago) offsite so I have NATs set up for udp 29810 as well as tcp 29811-14

This seems to work just fine generally for discovery and configuration, but not this fw upgrade.

Any suggestions welcome - thanks!