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Screen remains off (Black), but the Led light was On (BV 7000 Pro)

Before the first utilization the phone was charger 5h. After this the screen remains off (no picture, no text, no logo, nothing on the screen) but the Led light was on.

I moved your post to the right forum. When the screen is dead after first charge you could try to flash the latest firmware or exchange the device over your seller.