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Dear,
Please try to press the "vol-" and "power" button at the same time and hold on until your phone power off. Then you can press the power button to power on your phone again.
If this problem occurred again, please send email to me: support@91umi.com
At present you can't use rootjoy flash your phone, we haven't opened the permission of rootjoy.
You can update your FOTA on your phone, the newest version is V3.03-20160510, please following on these steps :
“Setting” -> “About phone” - > “Wireless update” - > “Check for updates” - > Update -> Done
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