You have held the power button until it reboots right. Have you tried a factory reset yet. I think I had to. I think I had to when I tried something similar.
Yeah, I tried that too but still no boot. There's not anyway I can fix it without a signed boot.img from ZTE. I just gave up and got a S5 for $150 that I could root and install roms on. It's a much better phone IMO
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