[Completed] Need Help With ZTE Grand X2 (Z850) Bootloader - XDA Assist

Hello, I want to unlock the bootloader for my zte grand x2 (z850) so i can root my device.
I have tried unlocking the adb fastboot way but my phone won't go into bootloader so that didn't work.
I have also tried kingroot, kingoroot, iroot, and rootgenuis. Now this semi worked because with bot iroot and kingroot i got a succeeded when rooting but when the phone reboots it gets stuck at the booting process with a black screen and red led. After this happens the only way to get my phone back up is to wipe data and cache in phone recovery.
So i can only think that its becaue of the bootloader, any help would be greatly appreciated.

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