EDIT: I have found how to dump the eShop music in any format (of audio obviously!) I tried some different formats and still nothing. Ive been trying to get custom eShop music and it results in no music (just sound effects). Ive done this so far, 1.Dumped extdata with extdata_dump 2.Replaced "boss_bgm1.m4a" on the SD card with custom music named "boss_bgm1.m4a" (From what Ive tested the custom music has to be same length so it would have to be 01:35 seconds. No more. No less. 3.Edited the config file in the extdata_dump folder to make it say "; replace eShop music RESTORE "boss_bgm1.m4a" "00000219:/boss_bgm1"" 4. Tested after it said "Success", eShop had no music. Just sound effects. You can try this yourself and maybe get it working. Just an Idea I had yesterday.