Upgrades can be done manually :
To upgrade manually :
.tar.xzfile is an archive format, like a
.zip. Just unzip this file onto your SD card/USB key to replace existing files.
Or, starting with batocera.linux 5.23:
For batocera.linux 5.7 to 5.22:
These commands upgrade – or potentially downgrade – the Batocera system. Upgrading or downgrading doesn't remove any of your user data (ROMs, metadata…). Like never, ever.
If you get an error message telling you that you don't have enough space on your Batocera system partition when you upgrade, there might be several explanations.
One of them is that you have stored several splash boot video files on the
/boot partition. Remove them, and try to upgrade again.