Android APK certificate matches prior APK but does not upgrade -

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i have signed apk same private key earlier releases. i've compared certificates following command.

unzip -p meta-inf/cert.rsa |openssl pkcs7 -inform der -out 1.txt -print_certs

i run command above on 2 apks , diff output. when that, there no differences in file.

yet, when attempt upgrade app, asked uninstall , install new app instead of in-place upgrade.

any thoughts on why apk signature can match yet, can prompt take right actions.


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