Introduction
If the device does not work despite a fully charged battery, then it may help to briefly grind the contacts of the safety key (safety pin/plug) with sandpaper.
What you need
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Grind until the contacts are glossy again.
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Almost done!
All done! Hopefully it works now. Make sure to not grind off too much of the key, or it won't work.
Conclusion
All done! Hopefully it works now. Make sure to not grind off too much of the key, or it won't work.
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