Uninstall rockbox from Sansa fuze + (Plus)

1. Copy the original firmware (firmware.sb) to the root of the machine.
2. Power off the machine.
3. Hold down the vol - button.
4. plug in the USB cable to the PC.
5. The machine will boot up and update itself.
6. Unplugged it when done.
7. Restart the machine will boot back to the original firmware.