# Get list of attached devices
adb devices

# Check battery power for detected device.
adb -s <SN> shell cat /sys/class/power_supply/battery/capacity

# Get current device version
adb -s <SN> shell getprop ro.build.description

# Reboot into RUU mode in bootloader
adb -s <SN> shell reboot oem-78

# Check if device is is disconnected from usermode
adb devices

# If not present any more, check via fastboot
fastboot devices

# If detected, check if in RUU mode
fastboot -s <SN> getvar boot-mode

# If mode returns RUU, start the upgrade by erasing cache
fastboot -s <SN> erase cache

# Upload rom.zip file and flash
fastboot -s <SN> flash zip rom.zip