I made a back up copy of the batocera file within the boot directory and deleted the batocera file, the update still says it has no space, I tried to copy the backup back in the original directory and now it says I don't have space for that either and now it doesn't boot WTF.
EDIT: I don't understand what's happening, I'm in Ubuntu, I deleted the batocera file, I have the "show hidden files option" on. I can only see the small files inside the partion, but it says I have 986,2MB of 2,0 Gb available, my original backup batocera file is 991,7 Mb and won't fit, but I can't find what is taking 1061,8 Mb inside the partition so I can free up some space. This linux thing is really complicated...