Android7.1/imx6 uboot how to unlock in fastboot

[lakehu]

I am running Android7.1/imx6DL.

Does anyone know

[root@localhost ]# ./android-sdk-linux/platform-tools/fastboot oem unlock

on device serial console

=> fastboot
ERROR: unknown variable: slot-count

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-count

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-count

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
ERROR: unknown variable: slot-suffixes

at drivers/usb/gadget/f_fastboot.c:2264/cb_getvar()
flashing unlock.
It is not able to unlock device.

[Rita_Wang]

Hi，

About the fastboot you can refer to the section 8.2 How do I use Android fastboot? in the Android_Frequently_Asked_Questions.pdf.
Have a great day,
Rita

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[lakehu]

Bootloader lock seems a new feature of Uboot for imx/android.

In the past, I don't meet this in Android5/6 of iMX.

Your document is same as Android 5/6.

Don't solve my issue.