Quote Originally Posted by gordon51 View Post
I tried this with a Nuvi 755T and it does not work!
What is it you tried with the 755T that didn't work ???

If you are trying to get the SD card SN on a 755T it's very simple.

1. Insert SD card (or microSD in an SD adapter)
2. Boot the 755
3. Hold battery ICon for ablut 8-10 sec to get to hidden screens
4. On the bottom of the hidden screen Hit NEXT 2 times and you'ls be at the "Data Card Test Page"
3. Serial number is on the upper let hand corner