Missing or lost Keystore of your android application
Now it is possible don't worry, here is the full and final steps to reset .JKS file.
Step-1
Download the UPLOAD CERTIFICATE (file name - upload_cert.der) from your Google Play Store Console
Step-2
Go to this LINK https://support.google.com/googleplay/android-developer/contact/otherbugs And fill the application form with your valid Email ID and upload the file (upload_cert.der).
Step-3
Now you will get the Email from support team, and they don't need your .JKS file but .PEM file here is the email Sample.
Step-4
to convert .JKS file to .PEM file you just have to download KeyStore Explorer 
After replying the Mail, wait for 48 to 72 hours your keystore fill will reset.
You can create a new keystore, but the Android Market wont allow you to upload the apk as an update - worse still, if you try uploading the apk as a new app it will not allow it either as it knows there is a 'different' version of the same apk already in the market even if you delete your previous version from the market
Do your absolute best to find that keystore!!
When you find it, email it to yourself so you have a copy on your gmail that you can go and get in the case you loose it from your hard drive!
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