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Can I downgrade my phone to the lower Android version?

How to flash the firmware?

Where can I download ROM or firmware for my phone?

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

How to unlock Bootloader(BL)?

How to access Recovery mode?

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

How to downgrade my phone?

How to exit the Fastboot mode?

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

Find my phone
Storage & File Manager
vivo & Google account
Music & Video
Backup & vivoCloud
Lag & Stuck
Purchase consulting
Personal Hotspot & Wi-Fi