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How to flash the firmware?

Where can I download ROM or firmware for my phone?

Can I install the firmware of other phones in my Vivo phone?

Is there an international firmware for the phones such as X21 sold in Chinese Mainland?

How to unlock Bootloader(BL)?

Can I downgrade my phone to the lower Android version?

How to downgrade my phone?

How to access Recovery mode?

How to exit the Fastboot mode?

It prompts "Decryption unsuccessful" while installing the firmware. What should I do?