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Here I have BlackVue 820 and let me show you how to enter the factory mode on the following device
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So at the very beginning let's start by pressing the power key. Let's choose power off and tap ok to confirm it
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So let's wait until your phone will be completely switched off. And afterwards you need to use the following combination of keys
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Power key and volume down. Let's hold down together those two keys for a couple of seconds
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So keep holding both keys and release them as soon as the BlackVue logo pops up in front
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of you. Let's wait a couple of seconds and this is the factory mode
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So here you can navigate by using volume down and confirm options by pressing power key
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As you can see here you can perform the auto test, so you can test all hardware features
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on your device. You can also perform the manual test, item test, you can see the test report, you can
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select debug test or perform the hard reset. So the Clear EMMC is the hard reset operation, let's just be careful with that one because
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you will lose all your data if you perform this option and you can also here choose version
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If you would like to quit this mode let's choose the last option which is reboot and
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press power key to confirm it. Let's wait a couple of seconds until you will be able to use your device
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