Mount your shares
mount -o remount,rw /dev/mmcblk0p1 /boot/ vim /boot/batocera-boot.conf ... # device to the share data (userdata) # sharedevice=INTERNAL ... # shares sharedevice=NETWORK sharenetwork_smb1=ROMS@nas:roms:credentials=/boot/.smb sharenetwork_smb2=SAVES@nas:saves:credentials=/boot/.smb sharenetwork_smb3=BIOS@nas:bios:credentials=/boot/.smb ...