I'm currently trying to upgrade my tp-link N600 to an Archer AX-20. 

From what I see, the AX-20 can't negotiate a 1Gbps with another AX-20. 

Here's my setup: 

When I'm connecting the Archer AX-20(1) to the N600 (with the same cables), the laptop is getting 270Mbps (using the speed test of fast.com). 

Looking at the management console of AX-20(1), I see this (when connecting the N600): 

(LAN 3 shows 1000Mbps)

However, When I connect the other (new) AX-20 (marked at number 2), I get the following in the AX-20(1) management console:

(LAN 3 shows 100Mbps).

From the UI of AX-20 (2), I see this: 

I see that 'Internet' is set to 100Mbps. Internet, here, is the link to AX-20(1).

This means (to me) that AX-20(2) can't negotiate a 1Gbps speed with AX-20(1), so I tried changing that. I manually set the negotiation speed to be 1Gbps (in AX-20(2)):

But, something doesn't work when I do that: 

I'm not getting any connection from AX-20(2) to AX-20(1). 

I've tried upgrading the firmware, resetting the router - and even replacing AX-20(2) to another router in the store, but still - I can't get AX-20(2) to negotiate 1Gbps with AX-20(1). 

Any tips? 

Thanks.