How to flash the firmware?
Can I downgrade my phone to the lower Android version?
How to unlock Bootloader(BL)?
Can I install the firmware of other phones in my vivo phone?
Where can I download ROM or firmware for my phone?
How to exit the Fastboot mode?
How to downgrade my phone?
Is there an international firmware for the phones such as X21 sold in Chinese Mainland?
How to access Recovery mode?
It prompts "Decryption unsuccessful" while installing the firmware. What should I do?