Every manufacturer is different.
Tap . The first boot takes 10–20 minutes (longer than usual). Do not force restart. upgrade android 4.4.2 to 9.0
Before trying advanced methods, check if your manufacturer ever released a later version for your specific model. Connect to . Go to Settings > About Phone (or Tablet) . Tap System Updates or Check for Updates . Every manufacturer is different
Improperly flashing software can "brick" your device, making it permanently unusable. 4. Alternative: Upgrade Your Device upgrade android 4.4.2 to 9.0
First, rule out any official paths provided by your manufacturer. Navigate to Settings About Device Software Update Check for Updates Update now Check for updates The Reality