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Here I have HTC One M8 and let me show you how to accomplish the hardest operation on
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this device by using the HTC function test, so by using a secret code
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So at the very beginning let me unlock the phone. Let's open the phone's dialer right here
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Let me use the following secret code, star hash, star hash, 3424, hash star, hash star
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As you can see HTC function test just pops up, let's accept the conditions
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This is the main menu but you have to choose more and here you should choose factory data reset
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Let's click it and let's tap run. The device will be set to the factory default
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Press back key to go to the next step, so if you are sure that you want to accomplish the hardest operation, so if you would like to erase all personal data and customize settings
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and also download apps let's choose back key. Here we got some information, let's tap ok to the factory settings information, tap ok
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once more time to begin the hardest operation and now the device is performing the factory
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reset operation, the phone is formatting all personal stuff, so let's just be patient
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wait until the operation will be completed successfully. Excellent, the welcome panel just pops up, so it means that the hardest operation is done
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