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i am submitting new version with some changes, while uploading following error occurred

UPLOAD NEW APK TO PRODUCTION

Upload failed
You uploaded an APK that is signed with a different certificate to your previous APKs. You must use the same certificate. Your existing APKs are signed with the certificate(s) with fingerprint(s):
[ SHA1: 5A:8D:B2:DB:61:DA:5F:3D:6B:2B:ED:38:86:AF:21:74:E5:1B:38:50 ]
and the certificate(s) used to sign the APK you uploaded have fingerprint(s):
[ SHA1: 91:3F:B4:C4:A7:FC:94:52:98:56:EE:11:C8:94:E0:FD:B8:FC:EF:F9 ]

what to do?
pl help

Hello! Do you have original project which you used to upload previous version?

yes i do have

Please share this app with a href="mailto:support@appery.io" rel="nofollow"support@appery.io/a so we can extract certificate. Also please send us request to a href="mailto:support@appery.io" rel="nofollow"support@appery.io/a and we'll send you certificate back.

i have that previous project & keystore file with me. what to do with that keystore file pl tell me.

You can't retrieve this file from original project, it's only possible on our end. Please share your app so we can help.

i have mailed it, pl do the needful

Thank you, but attachment has been blocked by firewall. Anyway we need you to share app with a href="mailto:support@appery.io" rel="nofollow"support@appery.io/a.
http://docs.appery.io/documentation/s...

i have shared it

Thank you!