Since the built-in Play Store on a 4.1.2 device may be too outdated to update itself, you must "sideload" the APK file. : Go to Settings > Security .
Android 4.1.2 (Jelly Bean) was released in 2012. Google officially ended support for this version years ago. While you can install a legacy version of the Play Store, many modern apps will no longer run, install, or update on this OS. download google play store for android 4.1.2
Open your device’s browser (likely the stock "Internet" app or an old version of Chrome). Since the built-in Play Store on a 4
You need an APK specifically compatible with Android 4.1+ (API 16). Using a version for newer Android releases will cause the installation to fail. download google play store for android 4.1.2