Taiwan Map for Nuvi 550

May I know which mapset should I download for my nuvi 550 from the below thread?
Garmin Taiwan City Navigator 2010.20 Update

Thanks in advance!
Great job to all contributors!

Well, I've went ahead to try out 2 links so far.
Nuvi 760
contains Taiwan Map, Taiwan Address Point 2010.2F, Junction View and Mapsource
Nuvi 205W/255W/265WT
contains Taiwan Map, Taiwan Address Point 2010.2F and Junction View
I've manually extracted the .img file out and loaded into my Nuvi 550, however, the device complains, "Cannot Unlock Map"?
Any advice would be much appreciated!

Thanks!