View single post by Majik
 Posted: Tuesday Jan 3rd, 2023 12:18 pm
 Full Topic 


Joined: Saturday Aug 26th, 2006
Posts: 33

  back to top

I'm having major issues doing a cable firmware update. I have a relatively new Comfort II Ultra system which, unfortunately, failed a firmware update and stopped working.
So I have attempted to do a serial cable update as described in
I dug out my trusty old UCM serial unit which I have previously used for firmware updates. When I plugged it in as described, the UCM started up fine when the RS485 cable was connected, but as soon as the PROG connector is inserted, the UCM seems to go into a restart loop. I tried another UCM and it does the same thing, so it seems to be the controller, not the UCM.
Note that my controller does not seem to have a PP2 header. 

Am I doing something wrong, or is the firmware bricked?

Last edited on Sunday May 7th, 2023 03:05 am by

 Close Window