Made a mistake and want to revert a version

hello i made a mistake and i delete a large part of my app .
is there a way to recover it?
if a staff can do it : MFD_JF17_V2 that is the app name in my account
and i would like to get it like it was 5 days ago

It looks like you learned the hard way how important it is to backup …
See also MIT App Inventor 2 Tips – TWO DOG APPS


i made a backup xD
the problème is that I accidentaly modifi the backup