@Kevin_Z In addition to the time being completely lost, I am unable to add any range extender in OneMesh with my TP Link ID. I always get a "connection time out" message.

@Kevin_Z Just an update. Unfortunately, the time has again lost itself. I reset the router today and still get the date as 17 May.

@Kevin_Z Thank you! I loaded the firmware and, for now, the most significant problems seem to have disappeared. Amazingly, even the built in SpeedTest is working correctly!!! Wow! Only two problems...

@Kevin_Z And another thing... I have had a network location added to my desktop since I don't remember when, certainly for the two plus years I've been using the AX11000. Basically, it comprises the...

@Kevin_Z Aside from the 5 GHz problem and it becoming impossible to downgrade the firmware, version 1.3.0 also weakens the connection of 2.4 GHz devices. For example my printer, which hitherto had a...

@lphoenixl I can confirm what @AX11000 has posted - the 1.3.0 firmware crashes the first 5GHz band, and, worse still, prohibits you from loading any other firmware version. You should feel lucky that...