If the JKS file is not available or has been lost, there are certain techniques that can help you create and upload a new JKS file, not just for Flutter but for any other Android app as well.
Losing a JKS file might seem like a big problem, but don’t worry! After watching this video, you’ll learn how to handle this situation without any hassle. You’ll be able to reconfigure your app with a new JKS file and continue using it just as before.
So, if your JKS file is missing, watch the video, follow the steps, and regain control over your app’s signing credentials.
Note: You can only upload a new key once a year, so be cautious when doing so. After submitting the request, avoid uploading any new files or making changes during the waiting period specified by the Google team(mentioned in email). It’s an automated process, so simply wait until the given time frame is completed. Once the waiting period is over, you can upload the new app with new JKS file successfully.
https://www.youtube.com/watch?v=004yy6o8s9Y
