I've gone back-and-forth with their support multiple times over this issue. I've lost faith that this will get anywhere. Basically, just get another product. I now use a MikroTik hAP ac, works great....

Since there is much interest, let me provide an update on my findings and experience. I've been in communication with TP-Link support, and they've provided me two firmware so far, the latest being...

uutommi wrote hi deniTHOR, try this beta firmware, it says to solve untagged traffic sourced from the AP. http://static.tp-link.com/AP500_eu-up-ver1-0-0-P1[20170720-rel38914].rar but i don't this...

deniTHOR wrote The version from the linked zip-file was the last one i got while working on my case: AP500_un-up-ver1-0-0-P1[20160607-rel48929].bin They did fix my reported bugs regarding the loop...

deniTHOR wrote That´s the version i got provided on my case. MultiSSID is working and you wont get a loop anymore with two APs in multiSSID Mode. I did not test more than that. The AP still sends out...

Kevin SG wrote anyone try this beta firmware before? http://static.tp-link.com/resources/software/AP500_un-up-ver1-0-0-P1_20160607-rel48929_.zip Any idea what it fixes?