#Create a Custom Boot Animation for Android [Nexus 5X]
#https://android.googlesource.com/platform/frameworks/base/+/master/cmds/bootanimation/FORMAT.md
#https://forum.xda-developers.com/showthread.php?t=2360825

mkdir boot
cd boot
echo "700 250 15" > desc.txt
echo "c 0 0 part0" >> desc.txt

mkdir part0
#place images in part0 folder
zip -0qry ../bootanimation.zip *

adb reboot bootloader
fastboot boot twrp.img
adb shell mount /dev/block/bootdevice/by-name/system /system
#you might want to backup the bootanimation.zip that is on the phone
adb push ../bootanimation.zip /system/media/
adb shell umount /system
adb reboot