@TP-Link I'm not sure this is the "best" solution. There are many apps using the local API, not just home assistant, presumably you're granting a downgrade for all. Clearly this is not a sustainable...

@Brook Why is this answer accepted? It's a non-answer - you don't know what you're going to do yet. And offering customers to downgrade firmware only on request isn't much of a solution. How often...

@Brook Did the OP really accept this as a solution, or did you accept it for him? Many of us bought these devices BECAUSE they could be accessed locally. If you've fixed a security fix, you haven't...

@Brook "We were aware that there were some security vulnerabilities on the previous firmware of HS100/HS110, some third-party software such as home assistant might take advantage of the vulnerability...

Kasa searches locally for the switch but won't find it from the 5GHz side - the protocol doesn't flow across bands. Most often you can rename your 5GHz SSID (don't rename the 2.4GHz or the HS100...

Sounds like you might not be directly connecting to the switch but instead the app is trying to go through the TP Link cloud service. One reason is if your phone is on your 5GHz signal - it might...