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Here I have Lark Evolution X2 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 me start by holding a power key, choose power off and tap ok to
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confirm it. Wait until your device will be completely switched off and afterwards let's use the
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following combination of keys. Power key and volume down. Let's hold down together these two keys for a few seconds, keep holding both keys and
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release all buttons as soon as the Lark logo pops up
0:53
Excellent as you can see the factory test mode just pops up
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Here you can navigate by using volume down and confirm options by pressing power key
1:03
So here you can choose the auto test, manual test, item test, let me select the item test
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press power key. Here you can for example test the blacklight level, let me tap it
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Let me show the test images. Let's choose test pass or fail, let me choose pass
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You can also test the memory card sim, vibrator, let me tap vibrator, let's choose pass
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Receiver, headset, sensor, camera, GPS, radio, bluetooth, wifi, battery and other stuff
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If you would like to go back let's press volume up. And you can also see the test report, you can choose debug test, you can select clear
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eMMC to accomplish the hardest operation. You can also check the version right here
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This is the version of my device, press volume up to go back
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Or if you would like to quit the factory test mode let's choose reboot and press power key
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to confirm it. Now the device is restarting and rebooting, let's wait a couple of seconds
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Excellent, as you can see now you can unlock the device and start using your tablet
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