works on d850
Works fine on ATT/D850. I copied the two zips the download folder and did this to install.
Also I renamed PowerOn.ogg to PowerOn.ogg.disabled in the /system/media/audio/ui folder to kill the sound.
Settings > General > About Phone > Software Information > 7 Hits on Build Number
Settings > General > Developer Options > USB Debugging, Stay Awake > Connect USB to Computer
open shell with adb:
adb.exe shell
su (grant permissions on phone)
mkdir /sdcard/StockBackup
cp /system/media/*animation.zip /sdcard/StockBackup
cp /system/media/audio/ui/PowerOn.ogg /sdcard/StockBackup
cp /Download/media/*animation.zip /system/media/
chmod 644 /system/media/*animation.zip
mv /system/media/audio/ui/PowerOn.ogg /system/media/audio/ui/PowerOn.ogg.disabled