OK, I've found a workaround... if you follow the instructions in the PDF that is in the firmware distribution zip, i.e., log in at tplinkdeco(dot)net and perform the upgrade then nothing happens (but...

@David-TP No, nothing in the logs.

I downloaded the 1.2.10 firmware from the EU website for my 5 x XE75Pro v2 (EU) and attempted to upgrade via the web interface. Having selected the (unpacked) upgrade file and pressed the Upgrade...

@IanAlmighty That's good to hear.

@IanAlmighty You can set the 6GHz SSID to the same as your 2.4/5GHz SSID after configuring your 6GHz WiFi to "Wi-Fi Network & Backhaul". I haven't tested it myself as I don't have any 6e-compatible...

I'm not sure what help you're asking for, but my immediate response is... You say you have BT's Home Hub 2 at the moment: do you mean BT Smart Hub 2 (SH2)? If so, then BT won't provide a replacement...