@Solla-topee I just changed the frequency on router settings and set back to default settings the adapter. The issue was just related to the frequency.

I solved the issue. I used the radar option of my wifi router and found someone else which uses 40MHz too. This caused to split the bandwidth to 400mbps. Also there was many 80MHz routers in range....

Hello! I've just installed this new wireless adapter on my PC. However I have maximum speed of 400mbps on 5GHz, no more. I've tried these drivers: Archer T6E_V2_200508_Win10 Archer T6E T9E_ASUS...