How to put your Lenovo A3900 into Recovery Mode
1. The first thing for you to do is to switch off the device.
2. Press and hold the Power & Volume buttons for five seconds or so, until an Android logo appears.
3. Now select Recovery Mode. To do that, use Volume Up to scroll down and Volume Down to select.
4. You are now in Recovery mode - navigate using Volume Up and select options with Volume Down.
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