Samsung Galaxy A40: Step-by-Step Bootloader Unlock Guide

Preparing Your Samsung Galaxy A40 for Bootloader Unlock

• 📶 Ensure your phone is connected to Wi-Fi before proceeding with the bootloader unlock process.
• 💾 Back up all important data from your phone, as unlocking the bootloader will perform a factory reset.
• 📧 Log out of your Google account to prevent Factory Reset Protection (FRP) lock, which can complicate the setup process after the reset.

Enabling Developer Options and OEM Unlocking

• 👆 Navigate to Settings > About phone > Software information and tap the Build number seven times to enable Developer Options.
• 🔑 If prompted, enter your screen lock PIN or password.
• ⚙️ Within Developer Options, locate and enable the OEM unlocking option. You may need to be connected to a network for this option to appear. Confirm your screen lock if required.

Unlocking the Bootloader

• 🔌 Power off your phone. Then, connect a USB-C cable that is already plugged into your computer.
• ⬆️ Simultaneously press and hold the Volume Up and Volume Down buttons on your phone.
• 🔓 You will see a screen prompting to unlock the bootloader. Press and hold Volume Up to confirm the unlock.
• ⏳ The phone will reset and restart, which may take approximately 5-8 minutes. Pressing the power key can speed up this process.

Verifying the Unlock

• 🚀 After the phone restarts, complete the initial setup. It is recommended to skip Wi-Fi connection during setup for a faster process.
• 🔍 Once setup is complete, reconnect to Wi-Fi, navigate back to Settings > About phone > Software information, and tap the Build number seven times to re-enable Developer Options.
• ✅ In Developer Options, the OEM unlocking option should now be enabled and grayed out, indicating that the bootloader is successfully unlocked.