Thanks for your help, Malpi12! Sorry about the links - I've fixed them now.
Yes, I have the Star Discovery mount without integrated wifi, but have a Synscan wi-fi adaptor - this one: https://www.ozscopes.com.au/skywatcher-wifi-adapter.html
As the fw loader, I am using the 2nd link you refer to above: "Windows program: Motor Controller Firmware Loader - WiFi, Version 1.76" which connects to the mount fine and reports the motor controller fw version.
I see what you are saying about the firmware I have downloaded though - it probably is designed for the mount with built-in wifi. But I am unable to find anything for my Star Discovery mount (i.e. the one without built-in wifi). Am I right in assuming that there is no fw update for my mount version (i.e. nothing beyond v2.18.A2)? I can't find any info about fw for this mount anywhere!
In terms of your question: "Did the mount not work with the original firmware?" - yes, it does. But there are a couple of updates in the v3.36 release notes for the wi-fi version fw that would be good to have.
Cheers,
SMD