I bought my 07 Tahoe last week, saw it had 2.0 disk, and ordered a 2010 disk off ebay (hasn't come yet). Now I see that it might behoove me to get a 4.1c disk to do the firmware upgrade - or would the 2010 5.0c disk do a firmware upgrade if it hasn't been done?

 

mine came w/the 4.1c i think, I have the 5.0 in it now...

 

I got my 2010 disk today via ebay. Called GMNAVDISK, they said no problem going directly to 5.0c. It did a firmware upgrade (5+ minutes preparing to load) and shifted the search area fro FL to WA.

Clock appears bigger. Added my home address and assigned a voice tag to it.
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good question, I am looking to update from the 3.0...look forward to the answer

 

V4.x has a firmware update. There does not appear to be a firmware update from 4.x to 5.x but I would assume that 5.x will upgrade any pre 4.x software.