@ParentsABC When AX23 is in AP mode you can't use its Parental Controls (details), so you are in the right path configuring this feature on your main router - AX20. Follow this thread for Parenatal...

@Mac5 Yes, it is.

@Marcin91 Follow this thread and see if it can help you set up your router to work with BT. Regarding the error message, you may use another ethernet cable (CAT 5E) to exclude any cabling issues.

@Archer3150 I doubt that AX53 is abandoned: Most probably the work on its latest official FW is still in progress.

@Nvidia1070 Can you test the adapter on Windows 10 and check if it works as expected ? If it does, then most probably it's not compatible with Windows 11 as seen from the compatibility list I posted.

@Rakib0023 Follow this troubleshooting directions and see if that will help you with your issue.