The Evolution of Android 7.1.2: Features and Technical Deployment

B. Flash via TWRP (custom ROM or packages)

Installing Android 7.1.2 Zip File

  1. Unlock Bootloader: Restart your phone in fastboot mode (Hold Power + Volume Down). Connect to PC. Run command: fastboot oem unlock.
  2. Extract the Download: Unzip the file you downloaded from Google.
  3. Flash: If you see a flash-all.bat (Windows) or flash-all.sh (Mac/Linux) file inside, double-click it. It will automatically wipe your phone and install Android 7.1.2.
  1. Enable developer options: Enable developer options on your device by going to Settings > About phone > Build number and tapping on it seven times.
  2. Enable USB debugging: Enable USB debugging on your device by going to Settings > Developer options > USB debugging.
  3. Connect your device to your computer: Connect your device to your computer using a USB cable.
  4. Extract the zip file: Extract the zip file to a folder on your computer.
  5. Boot your device into recovery mode: Boot your device into recovery mode by pressing and holding the power button and the volume down button simultaneously.
  6. Install the update: Install the update by selecting the "Install update" option in recovery mode.

OTA (Over-the-Air) Images

For Google-supported devices, official "zip" files are available as or Factory Images . These are the most secure way to update without losing data (if using OTA) or to perform a fresh start.

Scenario B: Flashing a Custom ROM ZIP via TWRP

Scenario A: Installing Official Factory Image (Google Devices)