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I have enabled developer options, enabled USB debugging and unlocked bootloader (OEM unlocking).

fastboot flashing get_unlock_ability
(bootloader) get_unlock_ability: 1
OKAY [ 0.000s]
Finished. Total Time: 0.000s

My phone is vivo Z1, its CPU is Snapdragon 660 AIE with Android 9 OS, security patch level 2021-02-01, it is system-as-root and has no ramdisk.

I am unable to unlock the bootloader:

PS C:\ProgramData\Android\SDK\platform-tools> .\fastboot oem unlock
FAILED (remote: 'unknown command')
fastboot: error: Command failed
PS C:\ProgramData\Android\SDK\platform-tools> .\fastboot flashing unlock
FAILED (remote: 'unknown command')
fastboot: error: Command failed

I have installed vivofastboot and vivofastboot_v2, and updated the dlls source

vivofastboot

vivo_fastboot bbk unlock_vivo
...
FAILED (remote: unlock fail.)
finished. total time: 0.000s

vivofastboot_v2

vivo_fastboot vivo_bsp unlock_vivo
...
FAILED (remote: check Signature Fail)
finished. total time: 0.000s

How can I unlock/root the Vivo Z1?

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