Unroot Samsung Galaxy Note 4 China: Step-by-Step Guide

This guide walks you through removing root access from a Samsung Galaxy Note 4 (China variant, model SM-N9100 or similar) and restoring it to a fully stock, unrooted state. Unrooting is necessary for receiving official OTA updates, using banking apps that detect root, or sending the device in for warranty service. You will need a Windows PC, the original USB cable, and a few free software tools — no technical background is required beyond following the steps carefully.

What You’ll Need

A Windows PC (Windows 7 or newer) with an internet connection.
The original Samsung USB cable (or a high-quality data cable).
Samsung USB drivers installed on the PC (download from Samsung’s official site or use Smart Switch).
Odin3 software (version 3.13.1 or newer) — a free flashing tool for Samsung devices.
The official stock firmware for your exact model (SM-N9100) — download from a reputable source like SamMobile or Sammobile’s mirror sites. Make sure it matches the China variant (usually ends with CHC or CHU in the PDA code).
Backup of your personal data (photos, contacts, messages) — flashing will wipe the device.

Step-by-Step

Back up your data. Connect the phone to your PC, copy all important files to a folder on your computer. Use Samsung Smart Switch or a cloud service to back up contacts, messages, and app data. Unrooting will erase everything.
Enable Developer Options and USB Debugging. On your phone, go to Settings > About Phone and tap Build Number seven times until you see “Developer mode enabled.” Then go to Settings > Developer Options and turn on USB Debugging.
Download and extract the firmware. Download the stock firmware for your exact model (SM-N9100). It will come as a ZIP file. Extract it to a folder on your PC. You should see a file with a name like AP_…tar.md5, and possibly BL_…, CP_…, and CSC_… files.
Download and run Odin3. Extract the Odin3 ZIP file and run Odin3.exe as administrator (right-click, then “Run as administrator”).
Boot your phone into Download Mode. Turn off the phone completely. Press and hold Volume Down + Home + Power simultaneously. When the warning screen appears, press Volume Up to enter Download Mode.
Connect the phone to the PC. Plug the USB cable into the phone and then into the PC. In Odin, you should see a blue or yellow box in the “ID:COM” section with a message like “Added!!”. If not, reinstall drivers or try a different USB port.
Load the firmware files into Odin. Click the AP button and select the AP_…tar.md5 file. If your firmware includes separate BL, CP, and CSC files, click the corresponding buttons (BL, CP, CSC) and select each. Do not touch the PIT button unless you have a PIT file (you usually don’t).
Verify Odin options. Ensure that Auto Reboot and F. Reset Time are checked. Re-Partition should be unchecked (unless you have a specific PIT file).
Start the flash. Click the Start button. The process will take a few minutes. You’ll see a progress bar in Odin and a green “PASS!” message when it’s done. The phone will reboot automatically.
First boot and verify unroot. The first boot may take up to 10 minutes. Once booted, check if root is gone: open an app like “Root Checker” (or look for the SuperSU/Magisk app — it should be gone). Also go to Settings > About Phone and confirm the baseband and build number match the firmware you flashed.

Common Mistakes

Using the wrong firmware. Flashing firmware meant for a different model (e.g., SM-N910F) will hard-brick your phone. Always verify your exact model number in Settings > About Phone or by looking under the battery.
Not installing Samsung USB drivers. Odin won’t recognize the phone without them. Install from Samsung’s official site or via Smart Switch.
Leaving Re-Partition checked. This can cause a boot loop or brick if you don’t have a PIT file. Keep it unchecked.
Interrupting the flash. Do not unplug the phone or close Odin during the process. A sudden disconnect can corrupt the system partition.
Forgetting to back up. Flashing wipes the internal storage. If you skip backup, you lose photos, downloads, and app data permanently.

Tips

Use a wired connection, not Wi-Fi, for downloading firmware. A corrupted download will cause flashing errors. Check the file size against the site’s listed size.
Disable Windows Defender or antivirus temporarily. Some antivirus software flags Odin as a false positive and may block it from running.
Close Samsung Smart Switch and Kies. These programs can conflict with Odin and steal the USB connection.
Use a USB 2.0 port on your PC if possible. USB 3.0 ports sometimes cause connection drops with Odin.
After flashing, perform a factory reset (Settings > Backup & Reset > Factory Data Reset) to clear any leftover root remnants and ensure a clean slate.

Troubleshooting

Odin doesn’t recognize the phone. Reinstall Samsung USB drivers, try a different USB port, or use a different cable. Also ensure USB Debugging is enabled.
Flash fails with “FAIL!” or “ Complete(Write) operation failed”. This usually means a bad firmware download or a connection issue. Re-download the firmware, restart your PC, and try again. If it persists, try a different USB port.
Phone stuck in boot loop after flashing. Boot into Recovery Mode (Volume Up + Home + Power) and wipe the cache partition and do a factory reset. If that doesn’t work, re-flash the firmware with Odin, making sure to uncheck Re-Partition.
Phone doesn’t boot at all (black screen). Try booting into Download Mode again (Volume Down + Home + Power) and re-flash. If the phone doesn’t respond, leave it charging for 30 minutes, then try again. If still dead, you may need professional help.
Root checker still shows rooted. Some root apps leave traces. Perform a factory reset after flashing, or re-flash the firmware again. Also check if you have a custom recovery (TWRP) — if so, flash the stock recovery via Odin (it’s included in the firmware as part of the AP file).

Frequently Asked Questions

Will unrooting void my warranty?

Unrooting restores the phone to its original state, so if you flash the correct stock firmware, the warranty should be valid again. However, the flash counter (if any) may still show that a custom firmware was installed. On many Samsung devices, the KNOX warranty bit is permanently tripped once root is installed, and that cannot be reversed. Check your device’s KNOX status in Download Mode — if it says “KNOX WARRANTY VOID: 0x1”, the hardware warranty is voided permanently, regardless of unrooting.

Can I unroot without a PC?

No, the only reliable method for the Galaxy Note 4 China variant is to flash the stock firmware using Odin on a PC. Some apps claim to “unroot” on the device, but they only remove the root manager (SuperSU/Magisk), not the modified system partition. That leaves traces and may not restore OTA updates.

Will I lose my data?

Yes, flashing stock firmware wipes the device. Back up all important data before starting. After flashing, you’ll need to set up the phone as new.

What if I have a custom recovery like TWRP?

Flashing the stock firmware with Odin will replace the custom recovery with the stock one, as long as you include the AP file (which contains the recovery). After flashing, check that TWRP is gone by booting into Recovery Mode — it should show the stock Android recovery.

Can I update to the latest Android version after unrooting?

Yes, once unrooted, you’ll receive OTA updates for the China variant. However, the Note 4 (SM-N9100) may have limited updates depending on the carrier and region. You can also manually flash newer official firmware using Odin if available.

What is the difference between unrooting and factory reset?

A factory reset only wipes user data and settings; it does not remove root access. Unrooting (via flashing stock firmware) replaces the entire system partition with the original one, removing root and any modifications. A factory reset is often done after unrooting to ensure a completely clean state.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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