Download old garmin language guide here:

[Only registered and activated users can see links. ]

Extract rar and copy LEX_PKG and gmapsupp.unl to SD card
Open keygen and put ID of SD card in keygen
Set to GLG and click generate.
Open gmapsupp.unl with notepad and copy/paste code from keygen to gmapsupp.unl
Click save.
Restart nuvi and garmin language guide is install from SD card to internal memory of nuvi.
After install delite LEX_PKG and gmapsupp.unl from SD card.
Copy this new LEX_PKG from this post to internal memory of nuvi and turn on nuvi.
New GLG must work now.