I see many users having many problems enabling features with the "enable features application" for this reason I prefere to recommend files to flash by sd posted in [Only registered and activated users can see links. ]
That's easier and successful for everyone.
I mean these:
Another way to convert 34xx with logo and enable features :

 Flash full 34xx firmware
Unpack the file to an empty SD card, turn nuvi off, insert card, turn nuvi on.
remove sd.

Files are attached to the above linked thread.