Thanks for pointing out, very interesting information about Taiwan Nuvis, but I remember that the above mentioned "006B082300.bin"-file was from Garmin USA.
They sold the map in USA and got complaints from customers that the map is unusable.
So in the moment I tend to believe that the above map is from Garmin USA (basemap is missing which was always a part of the English maps from Garmin China), then the "006B082300.bin" should work.
Btw. it seems only newer Taiwan models starting from 2013 can support also China maps. Got recently my hands on a 3560TW Nuvi, which had the bin file in the Garmin folder.
An older Nuvi 50 didn't had this file