NESC and i try FAT32, ext2/3 and NTFS. Same issue.
EDIT: Interesting. It's not freezing. I see only boot logo but when i get turn of NESC i see SHUTTING DOWN message.
Hello. Where i find step by step tutorial how add USB OTG to NES Classic. I go with KMFDManic Expandable_Storage_ReadMe! but everything freeze on Hakchi boot logo. Without USB work flawless.