I have not tried it yet, I assumed with the lag between Taiwan and UK releases that this new version coming so soon after RC3 was maybe RC2 or even RC1 and not worth the potential hassle. I have tried RC3 but reverted as the CPU load stuck at 50%.

I've just upgraded my 2865ac from 4.4.5.3RC3 std to 4.4.5.3_BT and there are definitely some differences. The first I've noticed is there is a timer function on the Bind to IP page that was not there on the RC release.

The upgrade worked fine and things have been stable for 4hrs not. No issues. Will report back if that changes

EDIT: My 2865ac has been up for 2 days now with no instability

I have been running 4.4.5.3 since Friday without any issues

Firmware 4.4.5.8 for the 2865 now on the main site, listed as Critical. Not on the UK site at present...

Following the pattern of urgency of this matter - we can expect this firmware around Easter in the UK 👌

Looks like its for multiple models, they must have found another vulnerability - its not been a good year for Draytek

Fingers crossed the UK versions get released ASAP