Well, it arrived today. The performance is a bit better with the antennas set to External than to Internal, though Auto seems to leave them on Internal.
However, placement makes more difference to the download speed than it does to the displayed signal level.
As you predicted, it did not have Bridge Mode in the Security menu. It was shipped with firmware 11.232...
I looked at the stuff about taking the device apart, and that didn't seem desirable, so I wondered if it was really necessary: it seems not.
All I did was to go to the Local Update menu item, and select the .bin file that came in the zip.
After a surprisingly long time, it came back in Polish, but with firmware 11.182.... I switched the language back to English and all my other settings seem to have been retained (I haven't done a system reset yet).
The Bridge Mode is there on the list of options.
I wonder if an update to the newer firmware will remove the Bridge Mode again? The auto update says it has the latest firmware, so perhaps it is a different fork.
Edited by hoopla (Sun 02-Jun-19 14:06:41)