How to Unlock Bootloader on Samsung Galaxy S21 Ultra 5G

Prerequisites for Bootloader Unlock

• 📶 Ensure your Samsung Galaxy S21 Ultra 5G is connected to Wi-Fi, as this is crucial for enabling developer options.
• ⚙️ Navigate to Settings > About Phone > Software Information and tap the Build Number seven times to enable Developer Options.
• 🔓 Within Developer Options, locate and enable OEM Unlocking; if it's not visible, verify your Wi-Fi connection.
• 🗑️ Before proceeding, remove any Google accounts from your device via Settings > Accounts and Backup > Manage Accounts to avoid complications.

Unlocking the Bootloader

• 🔌 Power off your device. Connect a USB-C cable that is already plugged into your computer to the phone.
• ⬆️ Simultaneously press and hold both the Volume Up and Volume Down buttons.
• 🔵 Continue holding the buttons until a blue screen appears, then release Volume Down and continue holding Volume Up.
• ❓ You will be prompted to unlock the bootloader; confirm by pressing Volume Up again.
• ⚠️ Be aware that this process will erase all data on your device. Ensure all important files are backed up beforehand.

Post-Unlock Verification and Next Steps

• ⏳ The device will restart and begin erasing data, which may take a few minutes.
• ✅ Once the phone restarts, you can set it up to verify the bootloader unlock status. Note that an unlock confirmation message may appear on each boot.
• 🔧 To confirm the unlock, re-enable Developer Options by tapping the Build Number seven times. OEM Unlocking should now be enabled and grayed out, indicating a successful unlock.
• 💡 The video mentions separate guides on the channel for flashing custom ROMs or installing custom recoveries.