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I always connect my devices as Mass Storage because I want to see everything in them.
Connect your etrex and get a full backup, then preform a master reset.
Master reset doen't delete any maps in the device (anyway you have Topodrive and its unlock file in your backup).
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Nothing worked so far.
What does the patched basecamp file do?
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It allows unlock with the JetMouse Key Gen and most importantly also patching MapInstall lets you save maps directly onto HDD without using a USB flashdrive or SD card.