Hi Petra
Have you looked at the skywatcher site
http://www.skywatcher.com/swtinc/cus...1=1&class2=101
The latest firmware is 3.27 and there are a few notes included in the upgrades. But you need to get the downloader as well
and you may need to install the ealier version 3.25 first
My Synscan came with v.3.27 so I did not need the update.
Barry