Hi, Here are some suggestions: https://www.tp-link.com/en/faq-2237.html Contact tplink support to troubleshoot if problem not solved.

Hi, There is limit to block devices through tether app. The limit varies between models. You may remove some of devices in the blacklist, then block new device to see if that works. If yes, then it...

Hi, Here's the suggestion https://www.tp-link.com/au/faq-2236.html Contact tplink support if problem not solved.

Hi, C5 has USB 2.0 port. That speed is normal.

Hi, Cannot disable physical reset button. Not on other tplink routers either.

Hi, Do you experience any security issue? There aren't any feedback like that regarding the router. Usually update will be released if there is any issue.