I have published my app in play Store Before some times.

Now I want to upgrade my app with new version. So I generate a signed apk for new version.

When I Upload my apk file, Play store gives me error that Your apk signed with different key.

I forget my old passord in previous version signed apk.

So Now My Question is how i can get my Old passord. Or any other option to put app in play Store again.

Please help me i am Confuse. Thank you so much.