First of all You should have root on device, second be able to change your partition on android device to status as: writeable (posted few posts ago what is the command for it).
I assume all is set. Now go in adb shell as a root to : /system/media/
When You call to list files, You will get two interesting files:
-rw------- root root 69056 2016-12-26 01:42 bootsamsung.qmg -rw-r--r-- root root 69056 2016-06-02 17:23 bootsamsungloop.qmg
First is the first static or animating animation, second is the loop. Usually it is like:
-show anoying operator animation
-show after that samsung animation
What to do is to backup first file, and copy the second one but renaming it like the backuped file, which is here “bootsamsung”.
As a result there will be two files as above, but both will do the same animation.