The string YKLZ is also repeated throughout the file and seems to act as a sort of file or directory end. There are multiple 'MIG' files which I believe are actually GIM files which is a format used by the PSP for images (these are likely the character portraits, backgrounds and ui). From this decoded boot.elf file I learnt that music is stored in the format at3 (which is atrac3) and sound effects as fsb (fmod sound bank). I have been attempting to reverse engineer a format for a visual novel psp game ('Mirai Nikki RE: WRITE - 13 Ninme No Nikki Shoyuusha') and I have come to the understanding that the format works as a type of archive by looking at the boot.elf file of the game.
