Need solution for reflash os on user build variant

[Raghul R]

Hi team,

I build my source by user build variant and flash it by fastboot tool. It flash and work successful ly. I used fastboot tool to reflash another os it show flash failed unknown fastboot commands.Now I want to reflash or erase the os.

Is it possible to reflash user build os by fastboot tool?.....Give solution for reflashing the os on user build variant....let me know

Thanks advance