Hello, if the phone has no power now, you need to use the original charger to charge for 30 minutes and then turn it on. If the power is sufficient, please try to enter the engineering mode to clean the cache and then restart it. 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.
If you cannot enter the engineering mode, it is recommended that you bring your mobile phone, warranty card and invoice to the local customer service center, where the staff will help you check your mobile phone and then provide you with help