@maxmonz Indeed the latest FW release. I found a similar problem in the Netgear community though. Have a look and see how this was resolved. If that doesn't work for you can try the AX55 Pro in AP...

@ZeshanAuto Let me see if I understand that correctly: If you connect your laptop to your main router wi-fi, you get a normal bandwidth. When you start your Archer C20 in RE mode and your laptop is...

@maxmonz Neither can I, that's why I suggested to set AX55 in AP mode. What your exact router model AX55 Pro or AX55 and what's its FW release indeed ?

@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.