I answered similar questions in the past.
“failed to load com32 file menu.c32” Below this display You should see “boot:” At this time Enter verbose or batocera on the keyboard and it should start with enter. If you want to start automatically, modify syslinux.cfg Example
SAY Booting Batocera.linux…
PROMPT 1
TIMEOUT 40
DEFAULT batocera
LABEL batocera
LINUX /boot/linux
APPEND label=BATOCERA console=tty3 quiet loglevel=0 vt.global_cursor_default=0
INITRD /boot/initrd.gz
LABEL verbose
LINUX /boot/linux
APPEND label=BATOCERA vt.global_cursor_default=0
INITRD /boot/initrd.gz