Existing FSB4 -> FSB5

Hey is there a way to maintain GCADPCM format but convert the FSB4 to an FSB5?

Ive tried using fsbankcl but get this error.

Allowing FSB source files
Gathering files…
Analysing files…
ERROR: invalid file: ‘0xe1953544.fsb’
skipped: ‘0xe1953544.fsb’ not a valid sound file
An error occurred while populating soundbank

GCADPCM is a proprietary Nintendo format so you need to be a registered Nintendo developer to work with it.