@JJJ123 There shouldn't be any significant differences - refer this post.

@ZeshanAuto 5GHz band is very susceptible for distances. Try using the 2.4GHz band and check if there's nay improvement. Best results you'll get if you use the Archer C20 in AP mode - Case 1 (if...

@maxmonz Have you considered to use your AX55 in AP mode (Case 1) to avoid the double NAT and also double port-forwarding.

@JustMeThree If you use a broadband service (not fiber) you most probably would need a DSL modem router to connect - check this thread:...

@garasakal TL-WA850RE is a single wireless band repeater - hence the 2.4 GHz band is active only. Good job, seems everything is working as expected now.

@garasakal Did you update the TL-WA850RE FW according to the thread I posted, what's its FW release ?