Well the .au website certainly has more choices of firmware and information than the .com or .uk websites have. I had always assumed the .tw website was the main, most up to date one.
Interestingly, although the au website has the released v4.4.5.2 and the beta v4.4.5.7RC7 firmwares it doesn't have v4.4.5.4 which is meant to be a critical update!

I was trying to find the time to get 4.4.5.4 working on my 2927ac, but as they are working on a 4.4.5.7 I think I won't waste the time and hope that 4.4.5.7 when it's released will install without the reboot issue.

Well, they're not neccesarily in order - for the 2866's the build date of the 4.4.5.2 is later than the 4.4.5.3 RC1 that was available on au.

If you've got the 4.4.5.4 for your 2927's I'd give it a go anyway - it's been good where I've tried it. And Draytek never seem to ever admin why they've removed something anyway - so hopefully it's obscure (albeit maybe important).

Well 4.4.5.5 is now up on the Taiwan FTP site...(& au)

https://fw.draytek.com.tw/Vigor2927/Firmware/v4.4.5.5/

Difficult to keep up!

Glad I waited as 4.4.5.5 has just appeared with, if I remember correctly, the same release notes as 4.4.5.4!
When I have the time to recover the router if this version gives the same root problem I'll give it a try. Unless another guinea pig wants to try it first and report back.!

Since I'm not having serious issues with 4.4.5.4 I'll give 4.4.5.5 a try....

OK - 4.5.5.5 up and running. No obvious differences so far, the Mesh Config Sync pages still have no means of user interaction. Interestingly my USB2 port has started working again..

I have noticed that re-booting is much faster with these 4.5.x.x. versions than it was with 4.4.3.x