ZTE Boost Max Black (Boost Mobile) Display: 5.7-inch HD IPS with Gorilla Glass Camera: 8-MP rear facing, 1MP front facing Input: Touchscreen with Corring. OS: Android 4.1 Jellybean If the phone does not turn back on and touch screen does not work at all : 1)Press and hold Volume Up + Power at the same time for a few seconds. 2)Release held keys when you see Recovery Mode. 3)Then press Volume Down to select option "Wipe Data/Factory Reset", and press Power button to confirm.