@tidy180sx By Tplink AC600 do you mean that you've bought an Archer T2U dongle ? If that's the case, you have to download and install it's drivers from the support page - here (mind its HW version).

@ML_Oracle What happens when you click on settings ? There should be an option to get the time from Internet and the two NTP servers like:

@butcher12 You may have bricked your router during the FW upgrade porcedure. Watch this video for how to fix that.

@ML_Oracle The IP address reservation data configured will be preserved during power outages. You can wipe this data by resetting the router to its factory defaults or by deleting it manually.

@croxrid If you forgot you router login password you should reset the router to its factory defaults by pressing the reset button for at least 5 seconds. Upon successful reset the router should...

@Mattia2 If your TL-WA850RE(EU) is HW Ver:1.20 the it supports only RE mode (HW version is printed on the RE sticker):