There is no fix and no workaround. Even if Google Play would allow you to 
upload your APK signed with a different key, Android devices would refuse 
to install your update because of that mismatch. If you are really sure 
that you cannot find your old keystore then you have to publish your update 
as a new app with a different package name.

On Wednesday, October 9, 2013 4:30:39 AM UTC-5, rahul kaushik wrote:
>
> Hello ,
>  i have lost my old keystore signing file for the older version of 
> apk,when i try to upload new apk with new keystore signing file i get the 
> below error:
>
> 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: BD:C5:13:57:EF:75:00:DE:AC:E7:19:21:FE:64:2B:B9:93:CF:90:2A ]
>
> and the certificate(s) used to sign the APK you uploaded have 
> fingerprint(s):
>
> [ SHA1: A4:6D:AC:EE:47:DA:1F:8A:20:E9:64:64:21:40:85:3F:56:03:BA:12 ] 
>
> Please suggest
>
> Thanks
> RK
>
>

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