Mobile phone firmware blog writer. Helpful, direct, plain English, knowledgeable (experienced), enthusiastic mobile geek (energetic, detailed). No dramatic phrases (“battle-tested”, “resurrection”, etc.), no movie-trailer voice. Do NOT use “I have worked on devices for a while now” or variations. Do NOT use contractions (e.g., use “do not” instead of “don’t”). Avoid formulaic AI patterns (“In today’s fast-paced world”, “Furthermore”, “Let’s dive in”, etc.). The first sentence under each H2/H3 must be a direct, factual answer. * Maintain all HTML/Gutenberg blocks. * Keep all hyperlinks and anchor text exactly as they are. * Keep all technical specs (model numbers, chipsets, versions) exactly as they are. * Keyword: “Samsung Galaxy S II 4G I9100M GT-I9100M firmware” (1-2 times per 300 words, natural placement). * Keep structured blocks intact (At a Glance, Compatibility Warning, etc.), but rephrase content inside bullet points. * FAQ questions must remain identical; answers must be rephrased. * No commentary or wrapping in the response. * *Phone:* Samsung Galaxy S II 4G I9100M GT-I9100M. * *Chipset:* Exynos 4210 Dual. * *Android:* 2.3 (Gingerbread). * *Tool:* Odin. * *Keywords:* Samsung Galaxy S II 4G I9100M GT-I9100M firmware. * *Opening:* Needs to be unique. No “Last updated” rewrite (keep the tag but change the text). Instead of “If your… is stuck…”, try something more direct about the available resources. * *Introduction:* Explain Odin and the files. Rephrase the “Knox” and “.tar.md5” part. * *Firmware availability:* Discuss the 2011 release and Exynos 4210 Dual. Use the keyword here. * *Hard Reset:* Direct answer first. Explain the buttons. * *FRP Bypass:* Direct answer first. Mention the launcher link. * *Common Reasons:* Direct answer first. Rephrase the list of reasons. * *Choosing Version:* Direct answer first. Rephrase the model/CSC/Binary/Build date/Download mode steps. * *Firmware Details:* (Keep table structure, just ensure text is clean). * *Which Version Table:* (Keep structure, rephrase internal text). * *Downloads:* Direct answer first. Rephrase the warnings about size and compatibility. * *Prerequisites:* Direct answer first. Rephrase the list (IMEI, accounts, battery, cable, drivers). * *Installation Guide:* Direct answer first. Rephrase the steps for Odin. * *After Flashing:* Direct answer first. Rephrase the bullet points. * *Troubleshooting:* Direct answer first. Rephrase the solution descriptions. * *IMEI Section:* Direct answer first. Rephrase the EFS and tool mentions. * *FAQs:* Questions identical. Answers rephrased. * *People Also Ask:* Questions identical. Answers rephrased. * *Conclusion:* Direct and helpful. * *Check:* “I’ve” -> “I have”. “Don’t” -> “Do not”. * *Check:* No “Furthermore”, “Moreover”, “Dive in”. * *Check:* Keywords integrated naturally. * *Check:* HTML blocks intact. * *Check:* Hyperlinks untouched. * *Check:* First sentences under headings are direct answers. * *Heading “Hard Reset”:* “You can perform a factory reset on the Samsung Galaxy S II 4G I9100M GT-I9100M by using a specific combination of hardware buttons.” (Direct answer). * *Heading “FRP Bypass”:* “The most effective way to remove the FRP lock on a Samsung Galaxy S II 4G I9100M GT-I9100M is by using a third-party apps launcher to enter the system settings.” (Direct answer). * *Heading “Common Reasons”:* “Reinstalling the Samsung Galaxy S II 4G I9100M GT-I9100M firmware is often the best solution for fixing severe software glitches or system crashes.” (Direct answer). * *Heading “Installation”:* “The standard method for installing firmware on the Samsung Galaxy S II 4G I9100M GT-I9100M is by using the Odin flashing tool on a Windows PC.” (Direct answer). * *Keyword Density Check:* “Samsung Galaxy S II 4G I9100M GT-I9100M firmware” appearing in: 1. Introduction section. 2. Firmware availability section. 3. Reasons section. 4. Download section. 5. FAQ/People Also Ask. * *No banned phrases?* Checked. * *No contractions?* Checked. * *HTML preserved?* Checked.
Last Updated: July 9, 2026
This guide provides the official files and a step-by-step process to restore a Samsung Galaxy S II 4G I9100M GT-I9100M that is stuck on the logo, locked, or not booting correctly.
Device: Samsung Galaxy S II 4G I9100M GT-I9100M | Chipset: Exynos 4210 Dual | Flash Tool: Odin
Android: Android 2.3 (Gingerbread) | File Type: .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)
⚠ Warning: Flashing erases all data. Back up first.
Device: Samsung Galaxy S II 4G I9100M GT-I9100M (Exynos 4210 Dual)
Flash Tool: Odin
Latest Build: the latest version
Firmware Files: 1 available
What You Need: Windows PC, USB data cable, Odin, USB drivers
Time Required: 10-20 minutes (plus 3-8 min first boot)
Samsung Galaxy S II 4G I9100M GT-I9100M Firmware (Flash File) Drivers, Tools & Guide
Using Odin to flash Samsung devices is a reliable process if you have the correct files and a stable connection. I have compiled the necessary Samsung Galaxy S II 4G I9100M GT-I9100M firmware, the compatible Odin version, and a detailed set of instructions on this page to help you get your device running again.
You should sign out of your Samsung account before you start the process. If you do not do this, Knox security may trigger a KG lock, which adds extra steps to the recovery. Please also check your file formats; Samsung firmware uses .tar.md5 files. Once you extract the ZIP archive, you should see files starting with AP, BL, CP, and CSC (or HOME_CSC). If those specific files are missing, you have downloaded the wrong package.
The Samsung Galaxy S II 4G I9100M GT-I9100M firmware available here is the official stock ROM, which is the best choice for unbricking, fixing FRP locks, or general recovery. Because this is a Samsung device, we use Odin for the installation. This tool is the industry standard for Galaxy phones and works across different chipsets. This specific build runs Android 2.3 (Gingerbread), which means you will return to the original apps and interface that came with the device.
The Samsung Galaxy S II 4G I9100M GT-I9100M first launched in 2011, and I keep this page updated with the best available builds. Every file listed here is sourced from verified repositories and checked for errors to ensure a safe flash.
Your download will arrive as a compressed ZIP file. Please use WinRAR or 7-Zip to unpack it. You are looking for files like AP_*.tar.md5, BL_*.tar.md5, CP_*.tar.md5, and CSC_*.tar.md5 (or HOME_CSC_*.tar.md5). If the extracted folder does not contain these, the package is not correct for your model.
Keep in mind that installing stock firmware wipes all user data. This is necessary to fix deep software issues such as FRP locks, severe system lag, forgotten patterns, bootloops, or connectivity problems with Bluetooth and Wi-Fi.
Factory Reset Samsung Galaxy S II 4G I9100M GT-I9100M Without a PC
You can factory reset a Samsung Galaxy S II 4G I9100M GT-I9100M without a computer by using the hardware buttons to enter the recovery menu. Turn the phone off completely, then hold Volume Up + Power (if your device has a Home button, hold Volume Up + Home + Power) until the menu appears. Use the volume buttons to highlight “Wipe Data/Factory Reset” and press the Power button to confirm.
This process wipes all personal data and returns the Samsung Galaxy S II 4G I9100M GT-I9100M to its original settings. It is a great first step for fixing app crashes, slow performance, or screen locks. If the phone is still not working after a reset, you should proceed with the full firmware flash using Odin as described below.
Remove FRP Lock on Samsung Galaxy S II 4G I9100M GT-I9100M
The most efficient way to get past the FRP lock on a Samsung Galaxy S II 4G I9100M GT-I9100M is to use a specialized apps launcher that provides access to the settings menu during the setup process. If you see a Google account lock after a reset or flash, our free Android apps launcher can help you bypass it quickly. To avoid this entirely, I always suggest removing the Google account from the device settings before you start flashing.
Common Reasons to Reinstall Samsung Galaxy S II 4G I9100M GT-I9100M Firmware
Reinstalling the Samsung Galaxy S II 4G I9100M GT-I9100M firmware using Odin is the standard way to fix critical software failures regardless of the internal chipset. Flashing the official ROM can resolve the following issues:
- Removing screen locks or disabled states.
- Installing the most recent supported Android version.
- Cleaning out deep-rooted malware that a factory reset cannot remove.
- Fixing battery drain or errors caused by failed OTA updates.
- Stopping random reboots or bootloops.
- Returning to the original stock ROM to ensure warranty compliance.
- Fixing Knox or KG lock errors that occur after a failed flash attempt.
You can read more about stock ROMs and why flashing works.
Choosing the Right Firmware Version
You must ensure the firmware matches your specific device variant to avoid causing permanent damage. Please follow these steps to verify your hardware identity before you download any files:
- Check the Model Number: Visit Settings › About Phone and find your exact model (such as GT-I9100M). Be careful with suffixes; U/U1 is for the USA, W for Canada, N for Korea, and B/F for Global. Firmware from the wrong region will not work correctly.
- Match the CSC Region: The 3-letter region code in the file name must match your phone. You can find this in Settings › About Phone › Software Information or on the Download Mode screen. Common codes include XAA, BTU, INS, and SER.
- Verify the Binary Level: Check the version string (for example,
XXU9BZDP). The number identifies the binary level. You cannot flash a lower binary version than what is currently on your phone. If you have Binary 9, you must use Binary 9 or higher. - Check the Build Date: The final 4 characters of the PDA version show the date. The first character is the year (A=2024, B=2025, C=2026), and the second is the month (A=Jan through L=Dec).
- Use Download Mode: Turn off the device and hold Volume Down + Power. This screen displays your model, CSC, and firmware version, which is the most accurate way to confirm your details.
Firmware Details for Samsung Galaxy S II 4G I9100M GT-I9100M
The following table outlines the official specifications for this firmware build:
| Firmware Information | Details |
|---|---|
| Device Model | Samsung Galaxy S II 4G I9100M GT-I9100M |
| Firmware Version | N/A |
| File Size | 628.4 MB |
| Android Version | Android 2.3 (Gingerbread) |
| Platform | Exynos 4210 Dual |
| Release Date | Released 2011, July |
| Region | Global, Africa and Asia |
| File Type | .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin) |
Which Firmware Version Should I Download?
Selecting the correct file depends on the current state of your device. Use this table to find the right recommendation for your specific problem:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | the latest version, download this one. It is the latest Samsung Galaxy S II 4G I9100M GT-I9100M firmware available. |
| FRP / Google account lock only | See the FRP bypass guide above, you likely do not need the full firmware for this. |
| Not sure which region/CSC to download | Check Settings › About Phone › Software Information for your current CSC, or enter Download Mode (Volume Down + Power), it shows the CSC on screen. Match the 3-letter code (e.g. XAA, BTU, INS) to the firmware filename. |
| Phone slow after a recent OTA update | Try the next older version, sometimes the latest OTA introduces new bugs and an older build runs better. Make sure the binary level is the same or higher than what your device currently has. |
| IMEI missing after a previous flash | Re-flash the latest version first, then follow the IMEI repair guide. Do not skip the reflash. |
| the latest version failed with a flash error | Try the next older version instead and double-check your AP/BL/CP/CSC file assignments in Odin before assuming the firmware is the problem. |
| Restoring to factory / warranty repair | the latest version, clean state, fresh start. |
To determine which Samsung firmware is more recent, look at the last 4 characters of the PDA version (e.g. S938BXXU9CZDP). The first character represents the year (A=2024, B=2025, C=2026), the second is the month (A=Jan, B=Feb… L=Dec, Z=final stable), and the final two are the revision. However, you must check the binary level first: the digit before the date code (e.g. XXU9CZDP = Binary 9). You cannot downgrade to a lower binary level. Always ensure the 3-letter CSC code matches your region.
Download Samsung Galaxy S II 4G I9100M GT-I9100M Firmware
You can find the official stock Samsung Galaxy S II 4G I9100M GT-I9100M firmware in the table below. The current available build is the latest version. After the download finishes, please check that the file size matches the specifications above; if the size is different, the file may be corrupt and could cause issues during the flash.
| Software Details | Download Link | Members Link |
|---|---|---|
|
File Name: I9100MUGMA5_I9100OYCMA5_VMC.zip Size: 628.4 MB | Download Link | Download Link2 |
Ensure you only download files that are compatible with your exact hardware. See the firmware selection guide above if you are not sure.
Important: Do not confuse the Samsung Galaxy S II 4G I9100M GT-I9100M (GT-I9100M) with other Galaxy S II 4G variants. Even within the same series, different models can use different processors and firmware. Always verify that your model code is exactly “GT-I9100M” in the Settings menu before proceeding.
- Verify in Settings that your model is exactly GT-I9100M. Similar model names often have different hardware.
- Confirm your device uses the Exynos 4210 Dual chipset. This firmware will not work on other processors.
- Use only the links provided in the table on this page to get the correct build.
- Check the file size after downloading to ensure the file is not corrupt or partial.
What You Need Before Flashing Samsung Galaxy S II 4G I9100M GT-I9100M
You should gather all necessary tools and prepare your device before opening Odin for the Samsung Galaxy S II 4G I9100M GT-I9100M. Two common pitfalls include forgetting to sign out of a Samsung account (which leads to KG lock) and using a low-quality USB cable that may disconnect during the process. Please use a high-quality data cable.
- Record IMEI Numbers: Dial *#06# and save both IMEI numbers. This is vital if you need to repair the network settings later.
- Sign Out of Google: Remove all Google accounts to prevent an FRP lock.
- Sign Out of Samsung: Remove your Samsung account to avoid triggering a KG lock.
- Save Your Data: Back up photos, contacts, and app data. Flashing will completely wipe the internal storage.
- Charge the Battery: Ensure the phone has at least 50% charge. A power failure during flashing is very difficult to fix.
- PC and Cable: Use a Windows computer and a certified USB data cable.
- Install Drivers:
How to Install Firmware on Samsung Galaxy S II 4G I9100M GT-I9100M
The standard method for installing firmware on the Samsung Galaxy S II 4G I9100M GT-I9100M is by using the Odin flashing tool on a Windows PC. For the best results, I suggest keeping “Auto Reboot” and “F. Reset Time” checked in the Odin options. If you are unsure about which version of the tool to use, you can visit our Odin versions page, as older devices sometimes prefer older software versions.
- Prepare the Files:
- Download the correct firmware from the list above.
- Extract the ZIP file. If there is another ZIP inside the first one, extract that as well until you have the .tar.md5 files.
- Install Drivers:
- Make sure the required drivers are installed. If Odin does not see your phone, the drivers are usually the cause. Reboot your computer after installation.
- Load Files into Odin:
- Click “BL” and pick the BL_*.tar.md5 file. Click “AP” and pick the AP_*.tar.md5 file. Do the same for “CP” and “CSC”. Use the CSC file for a clean wipe, or HOME_CSC if you want to try and keep data.
- Enter Download Mode:
- Turn off the phone. Hold Volume Down + Power (include the Home button for older models) until the warning screen appears. Press Volume Up to confirm and enter Download Mode.
- Connect the device to your PC. You should see “Added..” in the Odin log, confirming the connection.
- Execute the Flash:
- Click “Start” to begin.
- Do not touch the phone or the cable until the process finishes. A loose connection can cause the flash to fail.
- Reboot the Device:
- Once Odin shows a success message, disconnect the phone.
- Power on the device. It is normal for the phone to stay on the boot logo for a few minutes while it configures the new system.
Video Guide for Flashing
After Flashing: What Happens Next on Samsung Galaxy S II 4G I9100M GT-I9100M
You should expect the following behavior after you successfully flash your device:
- Confirmation of Success: A green “PASS.” message in the top-left corner of Odin indicates the process finished correctly.
- Security Data: All face and fingerprint data are wiped. You will need to set these up again in the security menu.
- Sound Settings: Ringtones and notification sounds will return to factory defaults.
- Available Storage: You will see nearly all storage capacity available since all user apps and files were removed.
- Boot Time: The first boot can take between 3 and 8 minutes. Do not force a reboot during this time, as it can cause a bootloop.
- Initial Setup: The phone will ask you to select your language and region, just like a brand new device.
- Bootloop Fix: If the phone fails to boot, enter recovery mode and perform a factory reset. See the hard reset guide above for steps.
Troubleshooting Samsung Galaxy S II 4G I9100M GT-I9100M Flash Errors
- Odin Displays “FAIL”:
- This typically happens if the firmware region or model does not match your hardware. Double-check your model number in Settings to ensure it is exactly the one required for the file.
- Device Not Detected by Odin:
- Ensure you have installed the correct Samsung USB drivers and that you are in Download Mode. If it still does not work, try a different USB cable.
- KG Lock or Knox Errors:
- This occurs if a Samsung account was active during the flash or if non-official firmware was used. Always sign out before flashing. If the lock is active, you may need a professional tool to clear it.
- Post-Flash Boot Loop:
- Boot into recovery mode (Volume Up + Power) and perform a factory reset. This removes old data that may be conflicting with the new firmware.
Missing IMEI or Corrupt Baseband on Samsung Galaxy S II 4G I9100M GT-I9100M After Flashing?
An “unknown” IMEI after flashing usually means the EFS partition, which holds your network and IMEI data, has become corrupt. Please remember that changing an IMEI to a number that did not belong to the device is illegal in many regions; only restore your original number. You can use tools like ChimeraTool or BFT to fix this. Be sure to check your local laws first.
Video Guide: How to repair IMEI
Samsung Galaxy S II 4G I9100M GT-I9100M Firmware FAQ
Q1: What if the flash fails halfway through?
A: You should not panic or unplug the phone. Close the Odin software, restart it, and attempt the flash again. Most of the time, a failed attempt does not damage the phone, and the tool will still be able to detect the device for a second try.
Q2: Can I go back to an older firmware version?
A: Some Exynos builds allow this, but downgrading can lead to app crashes or security gaps. If the newest version is not working well, please leave a comment below so I can help you find a better fix.
Q3: How long does the flashing process take?
A: The actual writing process usually takes 3 to 10 minutes. After that, the first boot can take an additional 3 to 8 minutes. Do not restart the phone during these steps. If Odin seems stuck, wait a few more minutes before deciding it has failed.
Q4: Will flashing void my warranty?
A: Installing official stock firmware generally does not void a warranty because it restores the phone to its factory state. However, some systems track bootloader unlocks or flash counts. Please contact Samsung support to be certain about your specific warranty.
Q5: How do I enter recovery mode?
A: Turn off the phone completely. Hold Volume Up + Power until the recovery menu appears. On older models with a physical Home button, you must hold Volume Up + Home + Power. You can use this menu to check your build number before you flash.
Q6: Will flashing erase my data?
A: Yes, it will. Using Odin to flash firmware restores the device to its original Android 2.3 (Gingerbread) state. This means all photos, accounts, and apps are removed. You must back up your files beforehand, as they cannot be recovered later.
Q7: Do I need an internet connection during flashing?
A: No, the process is offline. The data moves directly from your computer to the phone via the USB cable. You only need the internet to download the files and to set up the phone after it reboots.
Q8: My IMEI shows “unknown” after flashing. Is my phone permanently damaged?
A: No, this is a fixable software issue. Please refer to the IMEI repair guide in the troubleshooting section. This usually involves repairing the EFS partition. I recommend not inserting a SIM card until the IMEI is restored.
People Also Ask About Samsung Galaxy S II 4G I9100M GT-I9100M
What is the latest firmware version for Samsung Galaxy S II 4G I9100M GT-I9100M?
The most recent version available on this page is the latest version. There is currently one firmware build available for this model. You can find the Android version and file size in the specifications table.
Will flashing firmware on Samsung Galaxy S II 4G I9100M GT-I9100M erase my data?
Yes, it will. Using Odin to install stock firmware on the Samsung Galaxy S II 4G I9100M GT-I9100M triggers a full factory reset. All your personal files, accounts, and apps will be deleted. Make sure to back up everything before starting.
How do I check my Samsung Galaxy S II 4G I9100M GT-I9100M model number before flashing?
Go to Settings > About Phone to find the model number “GT-I9100M”. Alternatively, you can enter recovery mode (Volume Up + Power while off) to see the model code and build number. Always ensure this matches the firmware file exactly.
Can flashing firmware fix a bricked Samsung Galaxy S II 4G I9100M GT-I9100M?
Yes, it can. If the Samsung Galaxy S II 4G I9100M GT-I9100M is stuck on the logo or will not start, flashing the official stock firmware with Odin can fix it. This is the same method used by official Samsung service centers.
Conclusion
You now have the tools and the guide needed to restore your Samsung Galaxy S II 4G I9100M GT-I9100M to stock settings. As long as you follow the steps and install the drivers, the process is quite simple.
If you encounter any errors, please leave a comment with the specific error message and the step where it happened. I check the comments often and will help you troubleshoot the issue.
If this guide helped you, feel free to share it with others who are using the same device.
Browse all Samsung firmware downloads for more devices.
Disclaimer: Flashing stock firmware is performed at your own risk. Follow the instructions on this page carefully. I cannot be held responsible for any damage to your device, but I will always try to help if something goes wrong.
