Jetson AGX flash devicetree fail

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I’m making a customer board for Jetson AGX.So,I’m trying to change the devicetree with '$ sudu ./flash.sh -r -k kernel.dtb jetson-agx mmcblk0p1 ',but it doesn’t work , return ’ flash.sh command not found '.

  1. Should i need to flash on ubuntu computer?
  2. If I succeed in flashing, Do I just need restartting my AGX?