Why was exFAT chosen? It's a horrible filesystem, prone to issues and corruption, just like FAT32! What's the reason to not use something robust like ext4?
So what is the correct filename writing of the BIOS files? All in small letters?
SMB 1.0 is insecure, yes, but how does that matter in a multimedia environment? And just not allowing Recalbox connecting to SMB 1.0 actually doesn't stop the samba server from offering SMB 1.0 so the actual security inside a LAN isn't improved at all. I know people having their videos and stuff on very old & dumb SMB-only NAS boxes which still work perfectly fine for the purpose but are made obsolete by software enforcements like that.