Note: Installing a custom ROM requires an unlocked bootloader and is outside the scope of simple "APK downloading." If you are a beginner, stick to Part 4 above.
This is likely what you actually need. Since Android 6.0.1 is old, the Google Play Store may tell you: "Your device isn't compatible with this version." Android 6.0 1 Apk Download
: Marshmallow was the first to offer native support for fingerprint sensors, which 6.0.1 further stabilized for apps and system unlocking. Note: Installing a custom ROM requires an unlocked
The update introduced standard APIs for fingerprint scanners, allowing users to unlock their phones and authorize purchases on the Google Play Store Unicode 8.0 Emoji: Android 6.0 1 Apk Download