@Sour_Drop Follow this thread suggestions for changing the MAC address of your wireless adapter and check if that works in your case.

@pstreet Verify the hardware version of your device for the firmware version. Wrong firmware upgrade may damage your device and void the warranty. (Normally Vx.0=Vx.6/Vx.8 (eg:V1.0=V1.6/V1.8);...

@javarab Here's more detailed information on Deco eco mode. Go through this thread to see if the information can help with your issue.

@zulu0 Follow this story for using a special characters in your wireless password.

@fastasleep I would say there's no other option but to keep an eye on related official announcements in the community.

@GRMLP Anything rated AX3000 or above would do - check this filter.