lexus immob light flashes 21 code

[sideshow]

hi
anyone know what code 21 on a lexus immob light means

prob wrong key ?

thanks

[rashid01]

what is the model of lexus and year may need to re programme

[sideshow]

its 2000 ls400
i was hoping i could do an immob off dump but i flashed a new chip and soldered it on and the led flashes 21

next step is emulator