One for the mods I think.
I've just downloaded the image file for the BT Mini Hotspot 600 v1.1.0 firmware update from https://www.bt.com/help/user-guides/broadband-and-wi-fi-devices/wi-fi-and-home-networking/wi-fi-exte... but it reports as corrupt and, (not surprisingly) fails to load.
Any chance one of the mods could get the file reloaded please?
Thanks for pointing this out to us.
I will see if I can find out who runs this part of the website.