smart hjc 21b shut off when i plug it into the computer to do a firmware update
smart hjc 21b shut off when i plug it into the computer to do a firmware update
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That usually happens when the unit isn’t getting proper power or isn’t entering update mode correctly. Try using a different USB cable (data cable, not just charging), plug directly into a USB port instead of a hub, and make sure the device is fully powered off before connecting—some units only enter firmware mode that way. Also worth checking if your PC recognizes it at all when plugged in.
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Try a different USB cable or port—some cables don’t support data, only charging.
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