I had uploaded my app to Google Play (back when it was called Android Market) some time ago.
Today I updated the app, but I had deleted the previous keystore and cre
You can use new feature Google play app signing to generate a new key file .
After May 2017 Google play store add a new feature on Play store and It’s Good News For Android Developers. From this feature, Developer can update their app or Apk who lost a KeyStore file. you need to enable google play app signing on play store console.
https://support.google.com/googleplay/android-developer/answer/7384423?hl=en
http://www.geekcodehub.com/2018/05/23/keystore-lost-in-android/