PREREQUISITES:

1. Download Necessary Files:

   • Obtain the official firmware for your Vivo X21. You can usually find this on the official Vivo website or other trusted sources.
   • Download and install the appropriate flashing tool. Vivo devices often use the “SP Flash Tool” or other tools provided by the manufacturer.

2. Install USB Drivers:

   • Ensure that you have installed the necessary USB drivers for your Vivo X21 on your computer.

Steps to Flash Vivo X21 Firmware:

1. Extract Firmware Files:

   • Extract the downloaded firmware file. This should result in a folder containing the necessary files for flashing.

2. Install Flashing Tool:

   • Download and install the flashing tool on your computer. If you’re using the SP Flash Tool, for example, make sure to install it correctly.

3. Boot into Download/Flash Mode:

   • Power off your Vivo X21.
   • Press and hold the specified key combination to enter Download or Flash mode. The combination might be specific to your device, so refer to your device’s manual or online resources for guidance.

4. Connect Your Device:

   • Connect your Vivo X21 to the computer using a USB cable.

5. Load Firmware into Flash Tool:

   • Open the flashing tool on your computer.
   • Load the firmware files into the flashing tool. This usually involves selecting the scatter file or similar, depending on the tool.

6. Start the Flashing Process:

   • Once the firmware is loaded, initiate the flashing process. This might involve clicking a “Download” or “Start” button in the flashing tool.

7. Wait for Completion:

   • Allow the flashing process to complete. This may take some time, and you should see progress indicators on the tool.

8. Disconnect and Reboot:

   • Once the flashing process is complete, disconnect your Vivo X21 from the computer.
   • Power on your device and check for any improvements or changes.

Important Notes:

• Always use official and trusted firmware files and tools to avoid potential issues.
• Ensure that your device is compatible with the firmware version you are flashing.
• This process may void your warranty, so proceed with caution.
• Before you proceed, make sure to back up all your important data as the flashing process may result in data loss.
• Ensure your Vivo X21 has sufficient battery life or connect it to a charger during the process to avoid interruptions.

Remember that these instructions are based on general steps for flashing Vivo devices. The exact steps might vary slightly based on the specific firmware and version you’re using. So we can’t take responsibility for these instructions. Always refer to the official documentation and resources for your device and tools.