FAILED (remote: flash_cmds error!)

ZE551ML - 4gb ram
I encountered this error when flashing thru fastboot.
My phone came from no fastboot/recovery then flash firmware with xFSTK, was able to get fastboot.
Tried commands like;

fastboot flash fastboot droidboot.img
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img

none of this works, getting " FAILED (remote: flash_cmds error!) " error.
Images are from WW_ZE551ML_2.15.40.13_20150506 official rom.
tried the clear cache command it just escape out of fastboot mode.
Also tried Asus Flash tool but getting failed error.

I hope someone could help.

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