On my 898 SI, how can I determine what the original software version was? After upgrading several times, my coverage (especially 2D) kept getting worser and worser. I downloaded 6.1 from this site and everything seems back to normal. I was hoping to find out what the original was and if I could find it and put it back. I do not have 360 or I-pilot so all of the additions were unnecessary on the newest software update. The unit is 2 years old this month.