ZTE Z5031O refuses to go into bootloader mode

So i'm trying to get the bootloader unlocked so i can begin to mess with the device but it just doesn't want to go into the bootloader. It goes into recovery fine and i've tried going in there that way but it doesn't work. It just boots up android. Here's what i typed into my prompt.

adb devices
adb reboot bootloader
fastboot devices
adb reboot-bootloader
fastboot devices
adb reboot recovery
fastboot devices

Thank you in advance for trying to help

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