note however that reinstall batocera has no real meaning.
batocera is not like windows or recalbox,
the system (aka c: for windows) is read only and cannot be modified (or data are lost on reboot)
everybody has the same. it's why upgrading batocera is so simple,
and it's why reinstalling (ie copying the file /boot/recalbox again) does change nothing.
the only thing that change between 2 people is the data.
data includes : roms, saves, configs
if you want to restart from zero without losing roms and saves, the simplest is to remove the configs directory and retstart batocera (it will reput the default configs directory (available in /recalbox/share_init)