I Lost My .Keystore File

I lost My Keystore file. now how can i release update?

Keep your keystore and private key in a safe and secure place, and
ensure that you have secure backups of them. If you publish an app to
Google Play and then lose the key with which you signed your app, you
will not be able to publish any updates to your app, since you must
always sign all versions of your app with the same key.

There's no way to recover your key . Lost my keystore for uploaded app on android market .

So finally, Its not possible. Please Create new keystore with the application with different package name and version and publish as a new application.

Courtesy goes to Signing Your Applications .

I lost my .keystore file?

Faced the same problem. I was trying to restore it via deleted files restoring tools, but it failed. So, there is no other way: you should issue another application.

Generally, the only advise that exists on keystores: "always back it up!"

I lost my Keystore used to sign my apk. Is it possible to reupload in play store?

Yes, you can delete the previous application and re-upload it.
You won't be able to use the same package name though, as it will already be taken by your old app.
Simply re-upload it as you would when you want to publish a new app.

But remember,
you should always keep your keystore and passwords saved!

Android: I lost my android key store, what should I do?

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!

How to handle a lost KeyStore password in Android?

See this link

It's unfortunate, but when you lose your keystore, or the password to your keystore, your application is orphaned. The only thing you can do is resubmit your app to the market under a new key.

ALWAYS backup up your keystore and write the passwords down in a safe location.

Lost keystore file for app (but have Google Play App Signing enabled)

Seems it should work.
"Manage your app signing keys
With Google Play App Signing, you can securely manage your app signing keys for new or existing apps. Keys are stored on the same secure infrastructure Google uses to store its own keys.

If you lose your keystore or think it may be compromised, Google Play App Signing makes it possible to request a reset to your upload key. If you're not enrolled in Google Play App Signing and lose your keystore, you'll need to publish a new app with a new package name."
https://support.google.com/googleplay/android-developer/answer/7384423?hl=en

Instructions at the end of the page:

"Reset your upload key
Step 1: Generate a new private key and upload certificate
Step 2: Contact our support team"