Phones that do not allow bootloader unlock

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A bootloader is a program that runs when the phone turns on and loads the operating system. Most phones lock the bootloader by default, which means that a new bootloader or operating system can't be installed on the phone.

How it works

Some manufacturers do not allow unlocking the bootloader even if the phone is not under a contract. Some manufacturers allow to unlock the bootloader on some regions, or require a payment or an online connection to unlock the phone. Some manufacturers may void the warranty or block certain features permanently if the bootloader is unlocked

For more information, see the article on Bootloader Unlocking.

Why it is a problem

If the bootloader cannot be unlocked the operating system can't be modified in any way which is not allowed by the manufacturer.

Examples

• Huawei
• HMD Global/Nokia
• Vivo/IQOO
• ZTE
• Meizu
• Asus
• Alcatel
• Apple
• Energizer
• Cat
• Sharp
• Doogee
• TCL
• Coolpad
• Realme (on some regions)
• OPPO (outside China)
• Xiaomi (China only)
• Samsung
• HTC
• Motorola (on some devices)
• Google Pixel (Verizon)