Not sure if its the same as so long ago, it was more like updating a phone than a simple USB port. I downloaded it from a French site including PC boot loader software and windows drivers, took the cover off the router to be able to short out 2 wires so it booted into firmware mode and then connected it to a PC using a USB cable. Then using the bootloader software on a PC loaded up the firmware. The firmware worked but if I allowed it to update over the air then bridge mode went missing and I had to start all over again but stopping auto updates this time.
My broadband basic info/help site - www.robertos.me.uk. Domains, sites and mail hosting - Tsohost & Ionos.
Connections: OnePlus 8 Pro max 165Mbps down, 24Mbps up on Three, and B311 4G, tbb tests normally 35-45Mpbs down, 65Mbps off-peak, 9-24 up.
======================== The EU’s multiple failures are due to a deeper malaise .... What malaise? The EU’s formidable immunity to the smallest amount of democracy. New Statesman Feb 2021.