I tried to implement Firebase Cloud Messaging but I messed something up, so I Deleted the Project and unpacked my Backup.
Now I want to connect my app with Firebase again, but the problem is that it's saying that my SHA1-Certificate is already used by another app (of-course) and now I cannot link my app again.
How do I remove the connection between the SHA1 Certificate and the old App? Also, do I have to wait for 30 days now for the old Project being removed?