How to Soft Reset Microsoft Lumia 640 XL
Instruction I:
1. First of all, take off the phone's back cover and remove the battery.
2. Wait a few seconds and reassemble the phone. Lastly, press the Power button to turn it on. Done!
Instruction III:
1. Make sure that the phone is turned on.
2. Is it? Okay, now press'n'hold the Power and Volume Down buttons at the same time for ten seconds.
3. Your phone will now restart. Well done.
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