Help Me With App Signing Key

iam7275566445

New Member
I made my app with AppYet in 2017 and published it on Play Store. My friend recently learned app development and he built a customized app. I am not able to publish the new app as an update as it requires an app signing key for releasing it. Please provide me the signing key so that I can update my app. I don't want to lose my existing users.
 
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