The Samsung Galaxy A20s (model numbers SM-A207F, SM-A207M, and SM-A2070) is a popular budget-friendly smartphone that offers decent performance for everyday use. However, like most Android devices, it comes with a locked bootloader straight out of the box. Unlocking this bootloader opens up a world of possibilities – from rooting your device with Magisk, installing custom recoveries like TWRP, to flashing custom ROMs that can breathe new life into your phone.
If you've been wondering how to unlock the bootloader on your Samsung A20s safely and effectively, you've come to the right place. This guide will walk you through every step of the process in clear, easy-to-follow instructions. Whether you're a beginner or have some experience with Android modifications, this tutorial is designed to help you successfully unlock your device's bootloader.
Important Warnings Before You Begin
Before we dive into the actual steps, it's crucial that you understand the implications of unlocking your bootloader:
- Complete Data Wipe: Unlocking the bootloader will perform a factory reset on your device. All your data, including photos, videos, apps, and settings, will be permanently erased. There is no way around this – Samsung's security measures require a full wipe when the bootloader is unlocked.
- Voided Warranty: In most regions, unlocking the bootloader will void your device's official warranty. Samsung's Knox security counter will be tripped, permanently marking your device as modified.
- Loss of Secure Features: Certain Samsung services that rely on the Knox security platform may stop working after unlocking. This includes Samsung Pay, Secure Folder, and some banking apps that detect rooted or modified devices.
- OTA Updates May Fail: Official over-the-air (OTA) software updates may no longer work properly on an unlocked bootloader device. You may need to manually flash updates using tools like Odin.
- Proceed at Your Own Risk: While the process is generally safe when followed correctly, any mistakes during the procedure could potentially brick your device. Make sure you understand each step before proceeding.
Prerequisites
To ensure a smooth and successful bootloader unlock process, make sure you meet the following requirements:
- Backup Everything: Since all data will be erased, create a complete backup of your important files. You can use Samsung Smart Switch, Google Drive, or manually copy files to your computer.
- Battery Level: Ensure your Samsung A20s has at least 50-70% battery charge to prevent unexpected shutdowns during the process.
- Internet Connection: Your phone must be connected to the internet (Wi-Fi or mobile data) during the initial setup steps.
- Computer: A Windows PC or laptop will be needed for some steps and for installing USB drivers.
- USB Cable: Use a good-quality original Samsung USB Type-C cable to connect your phone to the computer.
- Samsung USB Drivers: Install the latest Samsung USB drivers on your computer to ensure proper device recognition.
What You'll Need
| Item | Description |
|---|---|
| Samsung Galaxy A20s | Must be model SM-A207F, SM-A207M, or SM-A2070 |
| USB Type-C Cable | Original or high-quality data cable |
| Windows Computer | For installing drivers and potential future flashing |
| Samsung USB Drivers | Download and install from Samsung's official website |
| Internet Connection | Required on the phone during setup |
| Patience & Attention | Read each step carefully before executing |
Step-by-Step Guide to Unlock Bootloader on Samsung A20s
Step 1: Check for Firmware Updates
Before proceeding, it's recommended to ensure your device is running the latest available firmware:
- Open the Settings app on your Samsung A20s
- Scroll down and tap Software update
- Tap Download and install
- If an update is available, follow the on-screen instructions to install it
- After updating, restart your device and proceed to the next step
Step 2: Enable Developer Options
The Developer Options menu contains the critical "OEM Unlocking" toggle that we need to enable. Here's how to unlock it:
- Open Settings
- Scroll to the bottom and tap About phone
- Tap Software information
- Find the Build number entry at the bottom of the list
- Tap on Build number repeatedly (7 times in quick succession)
- You'll see a countdown message: "You are X steps away from being a developer"
- After the 7th tap, you'll see the message: "You are now a developer!"
- If you have a screen lock set, you may be prompted to enter your PIN, pattern, or password to confirm
Step 3: Enable OEM Unlocking and USB Debugging
Now that Developer Options are enabled, we need to turn on the crucial settings:
- Go back to the main Settings menu
- Scroll down – you should now see Developer options listed above "About phone"
- Tap on Developer options to open the menu
- Scroll down to find the OEM unlocking option
- Toggle the switch next to it to the ON position
- A warning message will appear explaining the consequences of unlocking the bootloader. Read it carefully.
- Tap Enable to confirm your decision
- Next, find the USB debugging option and toggle it ON as well (this will be useful for future modifications)
- Confirm the USB debugging prompt if one appears
Important Note: If the "OEM unlocking" option is greyed out and cannot be toggled, this usually means:
- Your device hasn't connected to the internet yet (connect to Wi-Fi and wait a few minutes)
- Your device is a carrier-locked variant that doesn't support bootloader unlocking
- You may need to wait up to 7 days after initial device setup for the option to become available (this is a Samsung security measure on some variants)
Step 4: Power Off Your Device Completely
Once OEM unlocking is enabled, we need to boot into Download Mode:
- Press and hold the Power button on your Samsung A20s
- Tap Power off from the menu that appears
- Wait until the device is completely shut down (screen goes black and no vibration)
Step 5: Enter Download Mode
Download Mode (also known as Odin Mode) is a special boot mode on Samsung devices used for flashing firmware and unlocking the bootloader:
- With your phone powered off, prepare your USB cable and computer
- Press and hold both the Volume Up button AND the Volume Down button simultaneously
- While holding both volume buttons, connect your phone to your computer using the USB cable
- Keep holding the volume buttons until you see the Download Mode warning screen appear
- You should see a blue screen with a warning message about installing a custom OS
Step 6: Initiate Bootloader Unlock
Now we're at the critical step of actually unlocking the bootloader:
- On the Download Mode warning screen, you'll see instructions at the bottom
- Press and hold the Volume Up button for a few seconds to enter Device Unlock mode
- A new screen will appear titled "Unlock Bootloader" with a detailed warning
- Read the warning carefully – it explains that this action cannot be undone and will erase all data
- Press the Volume Up button once to confirm that you want to unlock the bootloader
Step 7: Confirm the Unlock Process
After confirming with Volume Up:
- The device will immediately begin the bootloader unlocking process
- Your phone will automatically perform a factory reset – this is normal and expected
- The device will reboot itself several times during this process
- Do not disconnect the USB cable or attempt to turn off the device during this process
- The entire process typically takes 2-5 minutes to complete
Step 8: Initial Setup After Unlock
Once the process is complete:
- Your Samsung A20s will boot up as if it's brand new
- You'll be greeted with the initial setup screen (select language, connect to Wi-Fi, etc.)
- Go through the setup process as you would with a new device
- Sign in with your Google account and restore any backups if desired
Verifying That Bootloader Is Unlocked
To confirm that your bootloader has been successfully unlocked:
- Go to Settings > Developer options
- Look for the OEM unlocking option – it should now be greyed out and toggled ON, with text indicating "Bootloader is already unlocked"
- Alternatively, you can reboot into Download Mode again – the top of the screen should now show "OEM LOCK: OFF" or a similar indication that the bootloader is unlocked
What Happens After Unlocking?
Now that your bootloader is unlocked, you have the freedom to:
- Root your device using Magisk to gain superuser access
- Install custom recoveries like TWRP for making full system backups and flashing ZIP files
- Flash custom ROMs that offer different features, performance improvements, or newer Android versions than what Samsung provides
- Remove bloatware that comes pre-installed on the device
- Apply system-level modifications and tweaks that aren't possible on locked devices
Troubleshooting Common Issues
Issue 1: OEM Unlocking Option is Greyed Out
- Solution: Ensure your phone is connected to the internet. If it's a new device, you may need to wait up to 7 days for the option to become available. Some carrier-locked devices do not support bootloader unlocking at all.
Issue 2: Cannot Enter Download Mode
- Solution: Make sure your phone is completely powered off before attempting. Try using a different USB cable or USB port on your computer. Ensure both volume buttons are being pressed simultaneously before connecting the cable.
Issue 3: Device Stuck on Boot Logo
- Solution: This can happen if the factory reset didn't complete properly. Try rebooting into recovery mode (Volume Up + Power) and performing a manual factory reset from there.
Issue 4: Knox Counter is Tripped
- Explanation: This is normal and expected. The Knox security counter is permanently tripped when the bootloader is unlocked, and there's no way to reset it back to 0. This is how Samsung detects modified devices.
Conclusion
Unlocking the bootloader on your Samsung Galaxy A20s SM-A207 is the first step towards unleashing the full potential of your device. While the process requires careful attention and comes with certain trade-offs (like warranty voidance and data wipe), the benefits of having an unlocked device are significant for Android enthusiasts.
By following this step-by-step guide carefully, you should now have an unlocked bootloader ready for rooting, custom recovery installation, or custom ROM flashing. Remember to always do your research before making any further modifications to your device, and never flash files that aren't specifically made for your exact model number (SM-A207F, SM-A207M, or SM-A2070).
If you found this guide helpful, consider sharing it with other Samsung A20s users who might be looking to unlock their bootloaders. Happy modding!
