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Make sure you start with a fully charged battery.
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Remove the battery from the badge.
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Press and hold the Select button, and then insert the
battery again.
The Badge U-boot screen appears.
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Press the Hold/DND button to see the factory reset menu.
The badge prompts, Reset badge?
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Press the Select button to confirm that you want to restore
the factory image on the badge. Otherwise, press any other button to cancel restoring
the factory image.
Once you confirm, the badge displays the following prompt: "Warning: Leave
the badge powered on for 10 min and wait. Do not interrupt."
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When the update is finished, the default settings are restored and
the badge can be configured again.