How to Soft Reset Microsoft Lumia 640 LTE
Instruction I:
1. Power up the phone.
2. Next, press & hold the Volume Down and Power buttons for ten seconds.
3. Well done. The phone should now restart.
Instruction II:
1. Hi. Please, remove the phone's back cover and battery.
2. Spend five seconds on contemplating the beauty of the world. Afterwards, put the phone back together and press the Power button. Well done, the soft reset is complete.
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