@ElToroBenito , I should add that for anyone else landing here - toggle the IPv6 to off, and upload speed should return to normal.

@Joseph-TP Thanks, I will give it a go. Meanwhile, I have submitted a new post regarding a separate issue with upload speed when using IPv6 here. Relevant to this post because it's the same firmware...

Hi all, I’m experiencing a persistent issue with my TP-Link AX50 router (Firmware version: 1.1.1 Build 20250917 rel.63889(4555)) where upload speeds are severely throttled when IPv6 is enabled. Issue...

@Alohomora Agree, the channel width of 160MHz has disappeared after this firmware update. It is simply not available in the mobile app or the browser.

@MegaShiver Just got the AX50 Router today and I've also noticed this behavior. If you turn QoS/Device Priority off for all devices, you'll get max speed from a device. I suspect the behavior is...