Because Android 4.1.2 is ancient, you will likely face three errors:
The last version of the Google Play Store that officially supports Android 4.1 (API 16) is version 20.2.09 20.2.09-all [0] [PR] 311811225 Minimum OS: Android 4.1 (Jelly Bean) Last Supported Play Services: Version 21.30.99 How to Manually Install (Sideloading) download google play store for android 4.1.2
: Hosts older versions such as 25.2.27 and even legacy "Market" versions like 9.9.21. Because Android 4
Before downloading, you must allow your device to install apps from outside the Play Store. Applications on some devices). Find the option "Unknown sources" and toggle it on the warning message that appears. Step 2: Download the Compatible APK Because Android 4.1.2 is ancient
Download Google Play Store for Android 4.1.2