I have a Huawei Honor 6. I have an unlocked bootloader, and I am trying to install marshmallow. I have flashed TWRP before (and I can boot to it and use it), so fastboot has once worked. Now when I try to do anything. Even to lock the bootloader, it is not possible. If I try to do anything it gives me Command not allowed error. Here while flashing:

D:\android sdk tools (adb and fastboot)\platform-tools>fastboot flash BOOT "D:\android sdk tools (adb and fastboot)\platform-tools\img\BOOT.img"
target reported max download size of 471859200 bytes
sending 'BOOT' (10272 KB)...
OKAY [  1.084s]
writing 'BOOT'...
FAILED (remote: Command not allowed)
finished. total time: 1.089s

I have searched around, but no answers. The phone shows up in fastboot devices. The only command that works correctly is fastboot reboot. fastboot unlock works, but it's already unlocked.

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