If none of those work, proceed to the hard resets.
Keep holding until you feel a vibration or see the Ulefone logo appear on the screen. Alternative Combination: If the power button alone fails, try holding Power + Volume Up simultaneously for about 15 seconds. 2. Verify Power and Charging How to fix ULEFONE Power Armor 13 black screen
Still black? Let’s try booting into Recovery Mode — it uses a different graphics driver that sometimes works when the main OS fails. If none of those work, proceed to the hard resets