Becker device can be unlocked the same way as Mio devices.
Flash (replace the original navi app with a script) or SD (find the magic folder, and create it into the root of SD Card + MioAutoRun folder) .
Take a look here
To find the magic folder look at :
Assuming that magic folder for Becker 50 (found in the picture above) is Daytona, try this unlock.
The two folders from archive copy into the root of a SD Card and restart the device.