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You're probably running 3.10 which does not have USB support for your player. Either update to a newer build with USB, or stick with 3.10 and use the sandisk software for USB.
You can reboot your player by holding the power button.There are uninstall directions in the manual.
Boot the original firmware if you want to use USB. saratoga already told you this.
You have to hold a button while booting. The manual can tell you which one. It's probably Left, but check to make sure.
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