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UPDATE GALAXY M55 5G ROOT

(Update) Galaxy M55 5G Root

Ultimate Guide to Rooting the Samsung Galaxy M55 5G with Magisk

We understand the desire to unlock the full potential of your Samsung Galaxy M55 5G. Rooting provides administrative privileges over the Android operating system, allowing for deep customization, performance tuning, and the removal of bloatware that Samsung typically installs. At Magisk Modules, we are dedicated to providing the most reliable and secure methods for modifying your device. This comprehensive guide details the process of rooting the Galaxy M55 5G using the Magisk patched boot image method via Odin.

Rooting via the patched boot image is the gold standard for Samsung devices. It utilizes the Odin flashing tool, which is the official software used by Samsung service centers to flash firmware. By patching the device’s specific boot.img file with Magisk, we create a systemless root that integrates seamlessly with the device’s security architecture, specifically Samsung Knox. While rooting will trip the Knox warranty bit, the benefits for enthusiasts and power users are immense.

This guide assumes you are working with a Windows PC and have a basic understanding of the command line and Android recovery modes. We will walk through every step required to achieve permanent root on the SM-M556B model and its variants.

Understanding the Prerequisites for Galaxy M55 5G Rooting

Before initiating the rooting process, ensuring that your environment is correctly set up is crucial. A single missing component can cause the flashing process to fail or, in worst-case scenarios, result in a boot loop. We have categorized the prerequisites to ensure you have everything ready.

Required Hardware and Connections

Essential Software Downloads

Software Conditions

Enabling Developer Options and OEM Unlocking

The Galaxy M55 5G, like all modern Samsung devices, keeps the bootloader unlocked state behind a software toggle. If this toggle is not activated, Odin will fail to flash the patched boot image, often showing a “FAIL (Auth)” or “SW REV. CHECK FAIL. DEVICE: 2, BINARY: 1” error.

To prepare your device:

  1. Navigate to Settings > About Phone > Software Information.
  2. Locate the Build Number. Tap on it seven times rapidly.
  3. You will see a toast message indicating “Developer mode has been enabled.”
  4. Go back to the main Settings menu and enter Developer Options.
  5. Scroll down and locate OEM Unlocking. Enable the toggle.
  6. Also, enable USB Debugging.

Note: On some carrier-locked variants or specific regions, the OEM unlocking toggle may be greyed out or delayed by a specific period (e.g., 72-168 hours) after connecting to the internet. If this occurs, simply wait for the designated time period.

Acquiring the Stock Firmware and Extracting boot.img

The foundation of rooting the Galaxy M55 5G is the stock boot.img. This file contains the kernel and the initial ramdisk. We must extract this file from the official Samsung firmware package that matches your device’s current build number.

Downloading the Correct Firmware

Use a tool like Frija or the SamFw website. Enter your model number (e.g., SM-M556B) and region code (e.g., BTU for the UK or INS for India). Download the latest available firmware package. This will usually be a large ZIP file (approx. 4-6GB).

Extracting the boot.img

Once downloaded, extract the ZIP file. Inside, you will find 4 or 5 files, including BL, AP, CP, and CSC. The file we are interested in is inside the AP file (usually named AP_M556B...tar.md5).

  1. Extract the AP Tar file: The AP file is a compressed archive. Using 7-Zip, extract the contents of the AP_M556B...tar.md5 file to a folder.
  2. Locate boot.img.lz4: Inside the extracted folder, look for a file named boot.img.lz4.
  3. Decompress: You need to decompress this file to get the raw boot.img. You can use a tool like the lz4 command-line utility or specific GUI extractors. Alternatively, some firmware packages may contain the boot.img directly in newer iterations, but the .lz4 compression is standard for Samsung.
  4. Transfer to Device: Copy the resulting boot.img file to your Galaxy M55 5G’s internal storage (preferably the Download folder).

Patching the Boot Image with Magisk

With the raw boot.img on your device, the next step is to apply the Magisk patch. This process injects the Magisk binary and management app into the boot image without altering the system partition permanently, adhering to the systemless root philosophy.

  1. Install Magisk Manager: Rename the downloaded Magisk APK file to Magisk.apk and install it on your Galaxy M55 5G. You may need to allow installation from unknown sources.
  2. Select the Target: Open the Magisk app. Tap on Install (or the first button on the card).
  3. Choose Method: Select “Select and Patch a File”.
  4. Locate boot.img: Navigate to the folder where you saved the boot.img (e.g., Downloads) and select it.
  5. Start Patching: Tap Let’s Go. Magisk will now patch the boot image. This process usually takes a few seconds.
  6. Locate Output: The patched file will be saved in your Downloads folder with a name like magisk_patched_[random_string].img.

Critical Step for Odin: Odin expects the file to be in .tar format. We cannot flash a raw .img file directly.

Flashing the Patched Image with Odin

This is the most critical phase. We will use the Odin tool to flash the magisk_patched.tar file to the AP slot of the Galaxy M55 5G.

Entering Download Mode

  1. Power off your Galaxy M55 5G completely.
  2. Press and hold Volume Up + Volume Down simultaneously.
  3. While holding these keys, connect the USB cable to the PC.
  4. The device will show a warning screen. Press Volume Up to continue.
  5. You are now in Download Mode (Odin Mode).

Configuring Odin

  1. Launch Odin3 as an administrator on your PC.
  2. Ensure the device is detected in the log window (left bottom box) by checking for a blue or green ID:COM box and “Added!!” message.
  3. File Assignment:
    • Click the AP button. Select the magisk_patched.tar file you created.
    • Note: We are ONLY flashing the patched AP image. Do not add BL, CP, or CSC files unless you are trying to restore stock firmware. Flashing only the AP is sufficient for rooting and preserves user data.
  4. Options Tab: Go to the Options tab in Odin.
    • Ensure Auto Reboot is UNCHECKED. This is vital. If the phone reboots automatically after flashing, it will likely overwrite the patched boot image with the stock one (due to AVB - Android Verified Boot), causing root to be lost or resulting in a boot loop.
    • Ensure F. Reset Time is checked.
    • Re-partition should remain unchecked.

Flashing Process

  1. Click the Start button.
  2. The flashing process will begin. You will see a progress bar on the device screen and a log in Odin.
  3. Wait for the process to complete. It should take less than a minute.
  4. Upon success, the ID:COM box will turn GREEN and display “PASS!!!”.
  5. Disconnect the Device: Immediately disconnect the USB cable after the PASS message.
  6. Boot to Recovery: Since Auto Reboot was disabled, the phone will remain in Download Mode or freeze slightly. Press and hold Volume Down + Power to exit Download Mode, but continue holding Volume Up and Power until the Samsung logo appears, then release only the Power button but keep holding Volume Up. This boots you into Stock Recovery.
  7. Reboot System: In the recovery menu, select Reboot system now.

Verifying Root Access on the Galaxy M55 5G

Once the device reboots, you will see the Magisk app icon. However, the app might be hidden or labeled “Stub”. You may need to reinstall the Magisk Manager APK if the icon is missing, but the binary is installed.

  1. Open Magisk Manager.
  2. Check the Installed version. It should match the version you patched with.
  3. SafetyNet and Play Integrity: We recommend using the Zygisk module and DenyList (formerly MagiskHide) to configure app hiding. For Google Play Integrity, you may need additional modules like Play Integrity Fix, available in our Magisk Module Repository.

Troubleshooting Common Issues

Even with a careful approach, issues can arise. We address the most common problems encountered when rooting the Galaxy M55 5G.

Odin Fail (Auth / Secure Check Fail)

This indicates that the device cannot verify the software signature.

Boot Loop After Flashing

If the device restarts repeatedly after the flash:

Magisk App Shows “N/A”

If the Magisk app is installed but shows “Installed: N/A”:

“System Corrupted” Warning

Upon booting, you might see a warning message about system integrity.

Post-Root Enhancements and Magisk Modules

Once your Galaxy M55 5G is successfully rooted, you can unlock a new ecosystem of modifications. At Magisk Modules, we host a curated collection of modules designed to optimize performance, battery life, and functionality.

Performance Tuning

Modules like LKT or custom kernels can adjust CPU governors and I/O schedulers. For the Galaxy M55 5G, which runs on the Snapdragon 7 Gen 1 (or similar), underclocking certain cores can yield significant battery savings without sacrificing daily performance.

Audio and Camera Improvements

Stock Samsung camera processing can be aggressive with noise reduction. Modules exist to enable Camera2 API fully or to sideload Google Camera (Gcam) ports that leverage the hardware more effectively. For audio, you can modify the Dolby Atmos libraries or Viper4Android for system-wide equalization.

Ad Blocking and Privacy

Using hosts file modules, you can block advertisements system-wide without needing a separate VPN. This is a systemless modification that is easily reversible through the Magisk app.

Updating the Firmware After Rooting

One of the significant advantages of Magisk compared to older rooting methods (like SuperSU) is its ability to survive OTA (Over-The-Air) updates, albeit with some manual steps.

  1. Download the Update: Use the stock Samsung updater to download the new firmware but do not install it yet.
  2. Restore Stock Boot Image: Use the Magisk app to select “Restore Image”. This removes the patched image and restores the stock one temporarily.
  3. Install the Update: Install the OTA update via the stock recovery.
  4. Re-patch: Once the update is installed, do not reboot immediately. Open Magisk and select “Install to Inactive Slot (After OTA)”.
  5. Reboot: The device will reboot into the updated slot with root preserved.

SafetyNet, Play Integrity, and Banking Apps

The landscape of Android security is constantly evolving. Banking apps and Google Play Services use Play Integrity API to check if the device is rooted or has an unlocked bootloader.

To maintain access to these apps on the Galaxy M55 5G:

  1. Enable Zygisk: Go to Magisk Settings > Enable Zygisk.
  2. Configure DenyList: Check the apps you want to hide root from (e.g., Banking apps, Google Wallet, Pokemon GO).
  3. Use Modules: We recommend checking our repository for the latest Play Integrity Fix module. This module spoofs the device verdict to pass the integrity checks. Note that this is an ongoing cat-and-mouse game, and modules are frequently updated to maintain compatibility.

Safety Precautions and Warnings

We take device safety seriously. Please adhere to the following warnings to avoid permanent damage to your Galaxy M55 5G.

Why Choose Magisk Over Other Root Methods?

We advocate for Magisk because of its systemless architecture. Unlike traditional root methods that modify the system partition directly, Magisk mounts itself to the boot partition. This offers several advantages:

  1. SafetyNet Bypass: MagiskHide (and Zygisk) allows root to be concealed from specific apps.
  2. Module Ecosystem: The modular system allows for easy installation and uninstallation of modifications without touching the core system files.
  3. OTA Updates: As mentioned, it allows for seamless system updates.
  4. Unrooting: Removing root is as simple as uninstalling the Magisk app or flashing the stock boot image via Odin.

Conclusion

Rooting the Samsung Galaxy M55 5G using the Magisk patched boot image method via Odin is a reliable and effective way to gain full control over your device. By following the detailed steps outlined above—enabling OEM unlocking, extracting the correct boot.img, patching it via the Magisk app, and flashing it safely with Odin—you can unlock the full potential of your hardware.

At Magisk Modules, we provide the tools and repositories necessary to extend the functionality of your rooted device. Whether you are looking to debloat your system, improve battery life, or install custom kernels, the Galaxy M55 5G offers a robust platform for customization. Proceed with caution, adhere to the prerequisites, and enjoy the freedom that root access provides.

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