There are separate threads (and some in the wiki) about using jumpdrive for various tasks. In short, its a way to connect L5 to a desktop/laptop (“normal” computer vs. the phone-computer-device) via usb cable, to make the L5 filesystem open like any other USB memory/disc. There is a procedure to make this happen, physical and on the host computer, but on the L5 no software is needed to be installed for it.
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