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If your certificate's file format is in pfx you will need to export it to a jks format. Follow these steps to do that:

* Access the following website and download KeyStore Explorer:
* http://keystore-explorer.org/downloads.html
* Open Key Store Explorer
* Open the key file (.pfx or other format)
* Type the certificate password
* Go to File > Save As
* Select JKS type and save it.

After that you can go to Android Studio and follow these steps:

* Top menu select Build > Build Variant
* On the left will highlight a table
* Select on the dropdown 'Release'

Build Signed APK

* On Android Studio go to Build > Generate Signed APK
* Key Store Path: insert the path for the .jks file
* Type in the alias and the password
* Click Next
* APK destination folder: place where the apk will be exported
* Signature versions: choose one of the versions
* V1 - all devices
* V2 - no mandatory, only works with android 7.0 or above