If you aren't familiar with what to do, after installing the 2013.40 map update via USB on your unit that supports Junction View, you would take the new full JCV file and copy it onto your SD card into /Garmin/JCV (create directory if not defined on your SD card). Then on the unit under .system/JCV, rename the JCV file that was installed with the 2013.40 update to D3060090A.JCV.small .
I just brought the Garmin Nuvi 2455LMT for the maps of Puerto Rico and Mexico. As soon as I installed the software, it found updates and firmware. Installed both on Saturday and started using it since. It's smaller than the Tom Tom XXL 350 but I do like this GPS. -- Illegal aliens have always been a problem in the United States. Ask any Indian. Robert Orben