Hello i have uploaded apk on google play and now i want to update the version of that but when i m updating it gives me following error: 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): now i have no idea what to do?? i have format my pc so i haven't keystore backup...so plz can anyone tell me how can i update apk version??