@switch_LinesYes you can, both work on 5ghz.

@bihavir It is because router updates current time, thats why you have ''unsaved changes''

@Awad_Ahmed https://www.tp-link.com/en/support/contact-technical-support/#E-mail-Support

@Awad_Ahmed You should contact support and let them know about this or it will never be fixed :)

@Awad_Ahmed Try connecting to you're other devices using hidden network, if it works its most likely a dlink firmware problem.

@Bicha There is almost nothing you can do because you have old hardware version of CPE, they just released updated firmware with new certificate valid till 2029 but you must have atleast v3 or v3.20...