command not available on locked device

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I unlocked the bootloader and flash the AOSiP rom without problem using the command "fastboot update rom.zip". However when I tried to flash another rom using the fastboot command it failed and gave me the message "command not available on locked device". I am confused since I already unlocked the bootloader to flash the AOSiP rom. What could be the problem? Thanks for your reply.

 

[[email protected]]

I unlocked the bootloader and flash the AOSiP rom without problem using the command "fastboot update rom.zip". However when I tried to flash another rom using the fastboot command it failed and gave me the message "command not available on locked device". I am confused since I already unlocked the bootloader to flash the AOSiP rom. What could be the problem? Thanks for your reply.

I forgot to mention that I rooted the AOSiP rom with magisk . I do not know if this is the cause of the problem.

 

[[email protected]]

I forgot to mention that I rooted the AOSiP rom with magisk . I do not know if this is the cause of the problem.

I found the answer. I need to first flash the stock recovery before I can use fastboot to flash another rom!