Please try these troubleshooting tips first:
- Make sure the official charger and cable are working with another device if possible.
- Power cycle the device by holding the Power button for 12 seconds.
- Attempt to start the phone by holding down the Power button.
If any of these methods do not solve your problem, please try the following steps:
Step 1: Let your phone rest for 12 hours (do not charge)
Step 2: Charge with the official charger and USB cable for 6 hours
Step 5: After 6 hours, your device should be ready to boot and power on.