Region : Malaysia

Model : TL-WDR4300

Hardware Version : Not Clear

Firmware Version :

ISP : Unifi

Hi, I'm from Malaysia.

So I just bought the dual band WDRN 4300 and a PCIE WDN4800

Initially after setup and configuration, all was fine and I could connect both 2.4ghz and 5ghz on my PC.

However after 4hours, I decided that I need to change my SSID and password, so I went into modem configuration again.
But this time, it made me unable to connect back to my 5ghz. It could be detected, but can't be connected

So everytime I try to connect to my 5ghz network, it lets me type the network password, then it tells me it can't be connected.
After then a red X would appear beside the network connection box and says that the settings on my PC do not meet the requirement of the router.

Please do advice, been reconfiguring the router and rebooting it for more than 10times.
I can't identify the problem, so I wouldn't know how to fix it. ><

Anyone has the same or similar problem?
I know its definitely not any faulty products as I've manage to use it awhile after the initial setup.

Thanks in advance for helping :)