Thread: City Navigator® North America NT 2010.30 -IMG Locked&unlock+ Mex&Can IMGs +mapsource version

Can someone tell me what is the easiest and best way to update an 855.

1) Use the unlocked version, and then put it in a SD card, or replace the original file in the unit directory?
---- Then download the lane assist file separately?
----- Do we just replace the original lane assist file in the unit directory, or do we
rename it to another file?
---- Should I also download the time zone file (I don't currently see it in my unit directory),
or that is not an available for the 855?

2) Use the locked Full Mapsource Version (Mapsource + 3d +JunctionView Files)?

Thank you.