Does any body know where you can find version release dates and what each update did for the units? I have a 898 v 6.60 and a 798ciSI v 6.30 and I would like to return them to an older software version. In my haste to update I forgot to write down the version I was running. I do not like the 6.60v it is putting things on the screen that I do not want like "COG" and it can not be removed.