This is yet another post that’s really a reminder for me, but you’re welcome to it if it helps. I’ve been working on the Android OS for a few months now and at first I was physically touching the phone to reboot it into fastboot mode and then back to the normal boot mode. I grew tired of this manual process and so one day it dawned on me that fastboot also had a reboot command & I could make a bash alias and run all the commands to do this process at once.

m && cd out/target/product/passion/ && adb reboot-bootloader && fastboot flash system system.img && fastboot reboot && cd ../../../../

You’ll hear the phone vibrate when it’s booting back up normally and know it’s time to get back to work…