RBK753 DNS Setting greyed out

[wxd4000]

Hi, I have a Orbi RBK753 mesh wifi system, I recently noticed the DNS setting is greyed out, and I am no longer able to use my NAS as my DNS server. I have tried to reboot the router and disable the parent control, but neither helps. The firmware version is V4.6.5.14_2.0.54. Is there anything I can do?

[FURRYe38]

Be sure Armor or Smart Parental Controls are not enabled. 

Netgear has set up a community forum specifically for the Orbi AX products. Most of the people who watch that forum are more likely to have experience with Orbi AX (WiFi6 RBK 3,7,8 and 9 Series) products:
https://community.netgear.com/t5/Orbi-AX/bd-p/en-home-orbi-ax

Please use this link to the main forum product list to review and choose where to make your posts. 
https://community.netgear.com/t5/NETGEAR-Forum/ct-p/en-netgear

Thank you.

[plemans]

Are you running it in access point mode? 

Got a screensnip? 

Are you using armor?  

[wxd4000]

Thank you for your reply!

It is not in AP mode. Armor and parental control are disabled. Screen shot is attached. You can see the DNS setup is grey-out, the router MAC address is also not able to be changed

[plemans]

have you tried a factory reset?