Spent a few hours troubleshooting my BE400 after it upgraded from 1.2.1 to 1.2.3

Background:  I use it only as an access point.  I only had 5ghz on previously.  single access point, mesh off.   simple enough, right.

worked perfectly fine on 1.2.1 but I couldn't get anything to connect after it upgraded.  phone, laptops, TVs.....

Solution/Bug:

I tried most parameters in an attempt to connect.   factory reset.  mac filter off/on.  scheduler on/off  Smart connect.  WPS.  airtime fairness on/off. different channels, different mixed modes. Changed 5g to open security and still couldn't connect.

Finally I turned on the 2.4 band with a unique SSID name and I was able to connect to the 5GHz band.

Re-enabled Personal3/2PSK for 5GHz and all was still good.  

I thought I would share just in case others experience issues with both 1.2.3 and 1.2.4 beta

previously no issues running just 5Ghz by itself.  I left 2.4 on simply because it works although I don't use it.

Hoping someone from TP sees this to both test and correct.

thanks