Preparation and Remarks
  1. Fully charge the battery.
  2. Close any applications before proceeding with the update.
  3. Calling and messaging functions are not available during the update process.
  4. Remove the microSD card.
  5. Please connect your USB cable directly to the PC. (Do not use a USB hub.)
  6. The handset is automatically reset during this process.
  7. The update takes approximately 10-30 minutes.
  8. Do not disconnect the USB cable until the update is complete.