How to Unroot Samsung Galaxy J1: Step-by-Step

Unrooting your Samsung Galaxy J1 restores it to its original factory state, which is necessary for receiving official OTA updates, using banking apps, or claiming warranty service. This guide walks you through removing root access and reinstalling the stock firmware, either by using the SuperSU app or by flashing the original ROM with Odin. Before you begin, back up any important data, as the process will wipe your phone.

What You’ll Need

• A Windows PC (Odin does not run on Mac or Linux natively).
• A USB cable compatible with the Galaxy J1.
• The correct stock firmware file for your exact model (e.g., SM-J100H, SM-J100F, SM-J100M) and region. Download from a trusted source like SamMobile or SamFirm.
• Odin3 software (version 3.09 or newer). Download from a reputable site.
• Samsung USB drivers installed on your PC, so the phone is recognized.
• If you rooted using SuperSU, you can use its built-in “Full unroot” option instead of flashing—this is the easiest method.

Step-by-Step

Method 1: Unroot via SuperSU (If You Still Have SuperSU)

1. Open the SuperSU app on your Galaxy J1.
2. Go to the “Settings” tab.
3. Scroll down and tap “Full unroot”.
4. Read the warning and confirm. The phone will ask for root permission, grant it.
5. Wait for the process to finish. The phone will reboot automatically. Once rebooted, root access is removed, but the system partition may still have remnants. To fully restore, continue to Method 2.

Method 2: Flash Stock Firmware with Odin (Complete Unroot)

1. Back up your data: Use Samsung Smart Switch or copy files to a computer. Flashing will erase everything.
2. Enable USB debugging and OEM unlock: Go to Settings > About Phone > tap “Build number” 7 times to enable Developer Options. Then go to Settings > Developer Options and enable “USB debugging” and “OEM unlock”.
3. Download the correct firmware: Identify your exact model number (Settings > About Phone > Model Number). Download the matching stock firmware from a reliable source. Ensure it is for your specific model and region.
4. Extract the firmware file: The downloaded file is usually a ZIP. Extract it to get a file ending in .tar.md5 (or .tar).
5. Install Samsung USB drivers on your PC if not already done.
6. Download and extract Odin to a folder on your PC. Run Odin3.exe as administrator.
7. Power off the phone. Then boot into Download Mode: Press and hold Volume Down + Home + Power simultaneously. When the warning screen appears, press Volume Up to continue.
8. Connect the phone to the PC via USB. In Odin, you should see a blue or yellow box in the “ID:COM” section indicating the device is detected. If not, reinstall drivers or try a different USB port.
9. In Odin, click the “AP” button (or “PDA” in older versions) and select the .tar.md5 firmware file. Do not touch other buttons like BL, CP, or CSC unless you know exactly what you are doing.
10. Ensure that only “Auto Reboot” and “F. Reset Time” are checked in the Options tab. Do not check “Re-Partition”.
11. Click “Start” to begin flashing. The process takes a few minutes. Do not disconnect the phone during this time.
12. When the process finishes, Odin will show a green “PASS” message, and the phone will reboot automatically. The first boot may take longer than usual.
13. After reboot, the phone is unrooted and running stock firmware. You can now re-lock the bootloader if desired (optional, but recommended for warranty). To re-lock, boot into Download Mode and use Odin to flash the stock “CSC” file (which often resets the device).

Common Mistakes

• Using the wrong firmware: Flashing a firmware meant for a different model (e.g., SM-J100F instead of SM-J100H) can brick your phone. Always double-check the model number.
• Disconnecting the phone during flashing: This can cause a hard brick. Keep the USB cable securely connected until Odin shows “PASS”.
• Forgetting to enable OEM unlock: If you skip this, Odin may fail to flash or the phone may not boot correctly.
• Not backing up data: Flashing wipes all internal storage. If you don’t back up, you lose everything.
• Using a USB hub: Connect the phone directly to a USB port on your PC to avoid connection issues.

Tips

• Before flashing, disable any antivirus or firewall on your PC that might interfere with Odin.
• Charge your phone to at least 70% to avoid it dying mid-flash.
• If you have a custom recovery like TWRP installed, flashing stock firmware will replace it with the stock recovery.
• After unrooting, check for OTA updates in Settings > About Phone > Software Update to ensure you are on the latest version.
• If you want to keep your data, you can try the “CSC” home file (sometimes labeled HOME_CSC) instead of the regular CSC, but this is not always available and may not fully unroot.

Troubleshooting

• Odin does not detect the phone: Reinstall Samsung USB drivers, try a different USB port, or use a different cable. Ensure the phone is in Download Mode (not just powered on).
• Odin fails with “FAIL!” or “SHA256 is invalid”: This usually means the firmware file is corrupt or for a different model. Re-download the correct firmware and try again.
• Phone stuck on boot logo after flashing: Perform a factory reset from recovery mode. Boot into recovery (Volume Up + Home + Power) and select “wipe data/factory reset”. This will erase data but should fix the boot loop.
• Phone is bricked (no response): Try re-entering Download Mode (Volume Down + Home + Power) and reflash the firmware. If that fails, search for “unbrick Samsung Galaxy J1” using a pit file, but this is advanced. If nothing works, take it to a service center.
• Root is still present after flashing: Some root apps may persist in the system partition. Flash a firmware that includes the “CSC” (not HOME_CSC) to fully wipe the system, or perform a factory reset after flashing.

Frequently Asked Questions

Will unrooting void my warranty?

If you fully restore the stock firmware and re-lock the bootloader, the phone will appear as factory state, and the warranty should be valid again. However, if the damage was caused by root (e.g., hardware failure from overclocking), the warranty may still be void.

Do I need to unroot to receive OTA updates?

Yes, most OTA updates will fail on a rooted device. Unrooting restores the system partition to stock, allowing updates to install normally.

Will unrooting delete my apps and data?

Flashing stock firmware with Odin will wipe your device. Using SuperSU’s “Full unroot” may preserve data, but it is not guaranteed to remove all root traces. Always back up first.

Can I unroot without a PC?

If you have SuperSU, you can use its “Full unroot” feature without a PC. Otherwise, you need a PC to flash stock firmware with Odin.

What if I don’t know my exact model number?

Go to Settings > About Phone > Model Number. It is crucial to use the exact model, as variants have different hardware and firmware.

Is it safe to unroot my Galaxy J1?

Yes, as long as you follow the steps carefully and use the correct firmware. There is a small risk of bricking if you make a mistake, but it is generally safe if you follow the guide.

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