I have downloaded the firmware update, but the board does not seem to be updating. All it says is sound files are not present.
I have a 32GB USB 3.0 Flash Drive,
https://www.amazon.com/SanDisk-Ultra-Flash-Drive-SDCZ43-016G-G46/dp/B00LLEN5FQ/
I have it formatted ExFAT.
In your Q&A, I cannot find any other specs.
pinsound-update-20062.psrom2 is loaded in the root directory.