Which model ? How did you rename it?

Edit:
I'll load to my 62 and post result, have you copied it in internal memory or in sd ?

Edit: I unlocked it with Fast IMG Unlocker ,loaded in my 62 :
sd/ Garmin/US_GarminLakes_Full.img
and it's selectable in Maps list and working fine.

Spoiler: pic
MG]http://i.imgur.com/fp8IS.png[/IMG]