Unofficial ROMs and rooting can expose your device to security vulnerabilities and may "brick" your phone (render it unusable) if not done correctly. Bitdefender Summary Comparison Android 4.4.2 (KitKat) Android 7.0 (Nougat) App Support Very limited; most new apps require 5.0+ Good; most modern apps still support 7.0 End-of-life; Play Services discontinued Legacy; receiving fewer security updates step-by-step guide for a specific phone model, or more details on custom ROM options Check and update your Android version - Google Help
You can verify if an official update exists by navigating to Settings > About Phone/Tablet > System Updates and selecting Check for updates .
: Not all 4.4.2 devices can run 7.0. Popular older devices like the Samsung Galaxy S4 or Nexus series often have community-made ROMs. Charge Your Battery : Keep it at least 60-75% charged .
: A built-in system setting that restricts apps from using data in the background, helping you save on mobile data costs. Improved Notifications
Spoiler: It’s not an official OTA update. But here’s how I did it, and how I verified the upgrade to “70” (Android 7.0).