Flash android firmware without reboot

#!/usr/bin/env bash

# Create a file named 'fastboot' in your PATH
# -- begin --
# fool the flash-all.sh: dtbo.sig
${ACTION} ~/installs/platform-tools/fastboot --skip-reboot $*
# -- end --

for slot in b a; do
    ${ACTION} fastboot set_active ${slot}
    ${ACTION} fastboot reboot bootloader
    ${ACTION} sleep 5
    ${ACTION} ./flash-all.sh
    ${ACTION} sleep 5
done

echo Remember to lock bootloader: fastboot flashing lock