Nighthawk M6 Pro MR6500

Have Nighthawk M6 Pro MR6500; connected to phones, computer.  When I first hooked up a Roku Express to the TV, it worked for the wireless connection.  Now it doesn't.  I've done everything I can think of.  Then I had a chat with Zeus on Roku Chat.  We went through the same troubleshooting that I went through, and now he suggests that I

Try to change the wireless channel as 1 or 6 or 11 for 2.4 GHz and as 161 for 5.0 GHz DHCP settings to IPV4 instead of IPV6 
⦁    DHCP settings to IPV4 instead of IPV6 
⦁     Disable MAC filtering 
⦁    The network mode should be B/G/NNetwork speed

6861283 please use this case number as reference. If you need any clarification of this issue, kindly reach us through support.roku.com/contactus

We will glad to help you.

Regards,
Zeus,
Roku Customer Support

Do you feel any of this will change the outcome of the streaming device working?  Or will this produce havoc to all the devices I have hooked up to the router?  I am not looking for any problems.