Boxing day买了个gps，garmin NUVI 250W，回来试着在线升级，目前基本信息如下：
s/w version: 3.10 -> 4.60
unit ID: 3495650732x
Audio ver: 2.00
GPS SW version: 2.38b -> 2.55b
basemap: AMR Autoroute Basemap NR 2.00
Change History
Changes made from version 4.40 to 4.60:
- Improvements in Bluetooth performance on supported units.
- Improvements in GPS performance.
- Improvements to traffic support.
- Added night-mode elevation color.
Changes made from version 3.10 to 4.40:
- Corrected shutdown issue associated with changing traffic provider.
- Improved demo mode initial setup.
- Updated Roadside Assistance number for UK.
- Fixed duplicate city listings when searching near your current route.
