1-Create a "Garmin" folder in an empty sd.
2-In Garmin directory create a directory named "Updater".
3-In Updater create a directory named as your nuvi HWID number, it must be 4 digits eg: 0971
4-In the above folder copy Ldr.bin . What is Ldr.bin? It is your firmware boot.bin you can extract with RGN_tool
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and rename it as Ldr.bin.
5-So copy it in "XXXX" (nuvi HWID) folder along an update.txt made with notepad where you'll write this command :