DO NOT rename the boot.firm. The bax firm goes on the root of the sd card. The original boot.firm and the .bax animation go into the bax folder. Multiple animations can go in the bax folder. On start up BAX will just choose one at random. It should look like this:
Example setups:
B9S:
boot9strap installed on FIRM0.
BAX in sdmc:/boot.firm.
Luma3DS in sdmc:/bax/boot.firm.
Other FIRMs in sdmc:/luma/payloads.
Unless you run fastboot3ds (like me) in which it should run like this :
fastboot3DS installed on FIRM0.
BAX in sdmc:/firm/bax.firm (with fastboot3DS default bootslot pointing to this).
Luma3DS in sdmc:/bax/boot.firm.
Other FIRMs in sdmc:/firm, selectable through fastboot3DS if desired.
Understand?
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Also, if you need me to convert and animation for you just ask