1, if the phone is now without electricity, you need to use the original charger to charge for 30 minutes and then start to try.
2, if the power is sufficient, please try to enter the engineering mode to clean the cache and then restart the try. Clearing the cache method: When the mobile phone is turned off, hold down the power button and the volume reduction key at the same time, enter the engineering mode, select the clearing cache option through the volume key, the system will automatically clear the cache for you. After clearing the cache, select Restart to check whether the system can boot normally.
3, if you can not enter the engineering mode, it is recommended to take the mobile phone, warranty card, invoice to the local customer service center, by the staff to check the mobile phone.