I use this web site now to check on firmware and BMS updates. Then either phone or email GE and ask them to do the update. The dongle firmware is quite important it seems not just WiFi. I don’t use WiFi I have an Ethernet connection, it was told that dongle does other things.
I have also updated it myself, it’s quite easy, get a memory stick (the right size) formate it and put files there, then change the dip switches to USB, plug it on and it happens, then put it back to what it was before you changed it to USB.
Out of the two, getting GE to do it is much easier and safer. The only thing they can not do is the WiFi security settings, you have to login and do these yourself.
Don’t bother with the app, as you need an installer account to login, so can only use the dongle update process that does not require you to login.
https://givenergy.co.uk/installer-resources/