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Imagine your device is hacked and you want to turn it off now (because of it is using network in bad manner), but the rootkit blocked all functions.

How do I forcibly turn off the device? I've tried holding the power button and the devide said it will reboot instead of shutting down.

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    Maybe it depends on the device, but on Nexus 4, when you hold the power for more than 5 seconds (someone said 15 seconds), it will be forced shutdown. What's your device?
    – Andrew T.
    Dec 31, 2014 at 18:42
  • I've tried on some HTC One (just the nearest device at the moment). I expected it to be device-independent.
    – Vi0
    Dec 31, 2014 at 19:29
  • Is this "forced shutdown" really hardwired or it is actually a command to some chip with flashable (i.e. infected) firmware?
    – Vi0
    Dec 31, 2014 at 19:30
  • I'm not sure on that, but it works on Nexus 4 running on stock Android (not infected at all). I'll test on other devices when I can access them.
    – Andrew T.
    Dec 31, 2014 at 19:32
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    Devices that have inaccessible batteries "hardwire" the power button to be a force off when held for a time, usually between 5 - 15 seconds. For the HTC One, I have read that putting the device under a bright light source is needed while holding the power. Source Dec 31, 2014 at 19:33

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