I think you cant use Updater.exe if USB connector is broken.
Ldr.bin is your firmware boot.bin you can extract with RGN_tool
You must build your directory in sd like in zip attached in post n1, but with files for your nuvi model with your HWID folder and the right ldr.bin, using the commands you need in update.txt.
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In case of nuvi 2xx (and in some outdoor devices like Dakota and O600) you need also to add update.log or commands wont be executed.
This thread is old and probably is the result of researches and user's curiosity after discovering other stuffs in other threads some time ago weird you haven't followed them.