Mobile phone firmware blog writer. Seasoned repair technician (direct, confident, helpful, workshop humor, no fake enthusiasm). * Plain, clear, everyday English. * NO dramatic words (“battle-tested”, “resurrection”, “purgatory”, “beast”, etc.). * NO “I have worked on devices for a while now” or variations. * NO contractions (“don’t” $rightarrow$ “do not”). * NO AI-pattern phrases (“In today’s fast-paced world”, “Furthermore”, “Let’s dive in”, etc.). * First sentence under H2/H3 must be a direct, factual answer for AI extraction. * Maintain all HTML/Gutenberg markup and hyperlinks exactly. * Keep technical specs and model numbers exact. * Keyword density for “Samsung I9100 Galaxy S II firmware” (~1% / 1-2 times per 300 words). * Keep specific structural blocks intact (At a Glance, Compatibility Warning, etc.). * Rewrite FAQ answers while keeping questions identical. * Vary opening hooks from previous articles. * *Device:* Samsung I9100 Galaxy S II. * *Chipset:* Samsung Exynos 4 Dual 4210. * *Tool:* Odin. * *OS:* Android 2.3.4 to 4.1.2. * *Common issues:* Bootloops, FRP, Logo stuck, IMEI missing. * *Opening:* Needs to be different from “If your [device] is stuck on a logo…”. Let’s start with a direct statement about fixing the device. * *Intro Paragraph:* Remove “fairly straightforward”. Use technician language. Mention the Samsung account/Knox issue clearly. * *Firmware Selection:* Explain the .tar.md5 files and the importance of matching the model. * *Hard Reset:* Direct steps. Explain what it does without using “resurrection” or “purgatory”. * *FRP Bypass:* Keep the link, be direct about the launcher. * *Why Firmware:* List the benefits clearly. * *Choosing Version:* Detailed explanation of Model, CSC, Binary, and Build Date. Keep it technical but readable. * *Firmware Details Table:* Keep the structure, just ensure content is accurate. * *Decision Table:* Rewrite the recommendations while keeping the logic. * *Downloads:* Keep the table and links exactly as provided. * *Prerequisites:* Checklist format. Emphasize the data cable (common tech frustration). * *Installation:* Step-by-step Odin guide. Clear instructions on file placement. * *Post-Flash:* What’s normal (warmth, boot time, etc.). * *Common Issues:* Troubleshooting steps for “FAIL” or “Not Recognized”. * *IMEI Repair:* Technical explanation of the EFS partition. * *FAQ:* Rewrite answers fully, no contractions. * *Conclusion:* Direct sign-off. * *Check:* Did I use “don’t”? $rightarrow$ Change to “do not”. * *Check:* Did I use “furthermore”? $rightarrow$ Remove. * *Check:* Is the first sentence under H2 direct? $rightarrow$ Yes. * *Check:* Keyword “Samsung I9100 Galaxy S II firmware” placement? $rightarrow$ Space them out. * *Check:* Did I keep all HTML comments ``? $rightarrow$ Yes. * *Check:* Did I keep the links? $rightarrow$ Yes. * *Check:* Did I use “battle-tested” or “beast”? $rightarrow$ No. * *Check:* Does the opening sound like the previous ones? $rightarrow$ No. (Old one: “If your [X] is stuck on a logo…”). New one: “Use the official Samsung I9100 Galaxy S II firmware to fix software glitches, bootloops, or system crashes.” * *Self-Correction during drafting:* I almost wrote “It is important to note”. I must replace that with “Remember” or just a direct statement. I almost wrote “Let’s get started”. Replacing with “Follow these steps”.
Last Updated: September 2, 2019
Use the official Samsung I9100 Galaxy S II firmware to fix software glitches, bootloops, or system crashes. This page contains everything you need to get the device running again, including flash files, Odin tools, USB drivers, hard reset steps, and IMEI repair guidance.
Device: Samsung I9100 Galaxy S II | Chipset: Samsung Exynos 4 Dual 4210 | Flash Tool: Odin
Android: Android 2.3.4 (Gingerbread), upgradable to 4.1.2 (Jelly Bean), TouchWiz UI 4 | File Type: .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)
⚠ Warning: Flashing erases all data. Back up first.
Device: Samsung I9100 Galaxy S II (Samsung Exynos 4 Dual 4210)
Flash Tool: Odin
Latest Build: the latest version
Firmware Files: 2 available
What You Need: Windows PC, USB data cable, Odin, USB drivers
Time Required: 10-20 minutes (plus 3-8 min first boot)
Samsung I9100 Galaxy S II Firmware (Flash File) Drivers, Tools & Guide
The Samsung I9100 Galaxy S II firmware is installed using the Odin flash tool to overwrite the existing system partition. I have organized this guide to provide the exact files and the process that works in a real workshop setting.
You should sign out of your Samsung account before you begin. If you leave the account active, Knox may trigger a KG lock, which adds a lot of unnecessary work to the process. Also, verify your files after extracting the ZIP; you need to see .tar.md5 files labeled AP, BL, CP, and CSC. If the files look different, you have downloaded the wrong package.
There are 2 different firmware files for the Samsung I9100 Galaxy S II available here. I recommend choosing the one that matches your current Android version to avoid stability issues. These devices originally shipped with Android 2.3.4 (Gingerbread) and can go up to 4.1.2 (Jelly Bean) with TouchWiz UI 4. Since this is a Samsung device, Odin is the only tool you should use, as it is the same software used by official service centers.
I have verified these files against known repositories to ensure they are clean and functional. Because the Samsung I9100 Galaxy S II is a legacy device from 2011, I keep this page updated with the final stable builds available for this hardware.
Your Samsung I9100 Galaxy S II firmware is delivered in a ZIP archive. Use WinRAR or 7-Zip to extract the contents. Look for the AP_*.tar.md5, BL_*.tar.md5, CP_*.tar.md5, and CSC_*.tar.md5 files. If these are missing, stop immediately and check your download.
Flashing stock firmware wipes the entire internal storage. This is the most effective way to clear FRP locks, system lag, forgotten passwords, bootloops, and connectivity problems with Wi-Fi or Bluetooth.
Samsung I9100 Galaxy S II Hard Reset Guide
A factory reset on the Samsung I9100 Galaxy S II is done by powering off the phone and holding Volume Up + Power (or Volume Up + Home + Power on models with a physical home button) until the recovery screen loads. Navigate to “Wipe Data/Factory Reset” using the volume buttons and press Power to confirm.
This process wipes all user data and returns the device to its original state. It is usually enough to fix app crashes or slow performance. If the phone is still acting up or will not boot, you will need to perform a full flash of the Samsung I9100 Galaxy S II firmware using the steps below.
FRP Removal for Samsung I9100 Galaxy S II
The most efficient way to handle FRP on this device is by using a third-party apps launcher to get into the system settings during the setup process. If you see a Google account lock after a reset, our free Android apps launcher can help you get past it. To avoid this entirely, always remove the Google account from the settings menu before you flash the device.
Why Do We Need Samsung I9100 Galaxy S II Firmware?
Official firmware is required to restore the core operating system of the Samsung I9100 Galaxy S II when a factory reset is not enough. Flashing with Odin resolves several critical issues:
- Installing the final supported Android version for the device.
- Removing system-level locks or disabled states.
- Fixing ghost touches or unresponsive screens caused by software corruption.
- Stopping random reboots or constant bootloops.
- Clearing forgotten PINs or patterns without the original user credentials.
- Recovering a device that is stuck in recovery mode.
- Fixing Knox or KG lock errors resulting from a failed flash attempt.
You can read more about stock ROMs and why flashing works.
Which Firmware Version Does Your Samsung I9100 Galaxy S II Need?
You must match the firmware to your specific hardware variant to avoid bricking the device. Use these steps to verify your model before you download any files:
- Verify Model Number: Check Settings › About Phone for the model code (e.g., I9100). Be mindful of suffixes; U/U1 is for the USA, W for Canada, N for Korea, and B/F for Global. Do not mix these up.
- Confirm the CSC Region: The 3-letter code in the filename must match your region. Find this in Settings › About Phone › Software Information or in Download Mode. Examples include XAA (US), BTU (UK), or INS (India).
- Check the Binary Level: Identify the binary digit in the version string (e.g.,
XXU9BZDP). You can flash the same or a higher binary level, but you cannot downgrade to a lower one. - Note the Build Date: The last four characters of the PDA version indicate the date. The first letter is the year and the second is the month.
- Use Download Mode: Hold Volume Down + Power to enter Download Mode. This screen provides the most accurate information regarding your model, CSC, and current version.
Firmware Details for Samsung I9100 Galaxy S II
The following table lists the technical specifications for the official stock firmware:
| Firmware Information | Details |
|---|---|
| Device Model | Samsung I9100 Galaxy S II |
| Firmware Version | N/A |
| File Size | 383.32 MB to 571.97 MB |
| Android Version | Android 2.3.4 (Gingerbread), upgradable to 4.1.2 (Jelly Bean), TouchWiz UI 4 |
| Platform | Samsung Exynos 4 Dual 4210 |
| Release Date | Released 2011, April |
| Region | Global, Africa and Asia |
| File Type | .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin) |
Which Firmware Version Should I Download?
Choosing the wrong file is a common mistake that leads to flash failures. Use this table to pick the correct Samsung I9100 Galaxy S II firmware based on your current situation:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | the latest version, this is the most recent stable build. |
| FRP / Google account lock only | Refer to the FRP bypass guide; a full flash is usually not required. |
| Not sure which region/CSC to download | Check Settings › About Phone › Software Information or check the CSC listed in Download Mode (Volume Down + Power). |
| Phone slow after a recent OTA update | Try the next older version if the latest update introduced bugs. Keep the binary level equal or higher. |
| IMEI missing after a previous flash | Flash the latest version first, then move to the IMEI repair guide. |
| the latest version failed with a flash error | Try the next older version and verify your file slots in Odin. |
| Restoring to factory / warranty repair | the latest version for a clean system. |
To determine which build is newer, check the last 4 characters of the PDA string (e.g., S938BXXU9CZDP). The first letter represents the year (A=2024, B=2025, C=2026), the second is the month (A=Jan, L=Dec), and the final two are the revision. Always verify the binary level (the number before the date code) because you cannot flash a lower binary than what is currently on the phone.
Download Samsung I9100 Galaxy S II Firmware
The official stock firmware for the Samsung I9100 Galaxy S II is available for download below. The current stable build is the latest version. After the download finishes, check that the file size matches the table above; if it is smaller, the download was interrupted and the file will fail during flashing.
| Software Details | Download Link | Members Link |
|---|---|---|
|
File Name: I9100XWLP7_I9100ODDLP9_INU.zip Size: 383.32 MB | Download Link | Download Link2 |
| File Name: I9100XWLST_I9100ODDLSE_INU.zip Size: 571.97 MB | Download Link | Download Link2 |
Only use firmware that is compatible with your specific model number. See the selection guide above if you are unsure which one to use.
Important: Do not confuse the Samsung I9100 Galaxy S II with other Galaxy S II variants. Different regions or models may use different chipsets. Always confirm the “I9100” code in your settings before proceeding.
- The model code must be I9100 exactly. Small changes in the model name often indicate a different chipset.
- The chipset must be Samsung Exynos 4 Dual 4210. You can verify this in recovery mode.
- Do not use files from other sources in combination with these.
- If the file size is incorrect, re-download it to avoid a partial flash failure.
Samsung I9100 Galaxy S II Flash Setup Checklist
Complete this checklist before launching Odin for your Samsung I9100 Galaxy S II. I often see flashes fail because of a poor USB cable or an active Samsung account triggering a lock. Use a high-quality data cable and connect directly to your PC motherboard ports.
- IMEI Backup: Dial *#06# and write down your IMEI numbers. You will need these if you have to perform an IMEI repair later.
- Remove Google Accounts: Sign out of all Google accounts in Settings to prevent FRP lock.
- Remove Samsung Accounts: Sign out of your Samsung account to prevent KG lock.
- Backup Data: Move all photos and contacts to a computer. Flashing will wipe the device clean.
- Battery Level: Ensure the battery is at least 50%. A power failure during a flash can lead to a hard brick.
- Hardware: Use a Windows PC and a reliable USB data cable. Avoid using USB hubs.
- Install Drivers:
Flashing Samsung I9100 Galaxy S II Firmware With Odin
Use Odin to perform the flash. I recommend keeping “Auto Reboot” and “F. Reset Time” checked for the cleanest result. If the current version of Odin does not work, check our Odin versions page as older devices sometimes prefer older tool builds.
- Prepare the Files:
- Download the correct firmware and extract the ZIP. If there is another ZIP inside, extract that one as well until you have the .tar.md5 files.
- Driver Setup:
- Ensure the USB drivers are installed and restart your PC. Without these, Odin will not see the phone.
- Load Files into Odin:
- Click “BL” for the BL file, “AP” for the AP file, “CP” for the CP file, and “CSC” for the CSC file. Use HOME_CSC if you want to try and keep data, or CSC for a full wipe.
- Connect in Download Mode:
- Power off the phone. Hold Volume Down + Power (and Home if applicable) until the warning screen appears. Press Volume Up to enter Download Mode.
- Plug the phone into the PC. Odin should display “Added..” in the log.
- Execute Flash:
- Click “Start”. Do not touch the cable or the phone until the process is finished.
- Completion:
- When the success indicator appears, unplug the phone and turn it on. The first boot will take a few minutes while the system initializes.
Video Guide for Flashing
What Is Normal After a Samsung I9100 Galaxy S II Flash?
Several things happen during the first boot after a successful flash that you should expect:
- Success Confirmation: A green “PASS.” message in Odin means the firmware was written correctly.
- Heat: The device may feel warm during the first start-up as it configures the system.
- Google Login: If you did not remove your account before flashing, you will face an FRP prompt. Sign in during the setup wizard.
- Default Settings: All ringtones and notification sounds are reset to factory defaults.
- Storage: Your storage will be mostly empty. System partition sizes on these models usually range between 4 and 8 GB.
- Boot Time: The first boot can take 3 to 8 minutes. Do not restart the phone manually, as this can cause a bootloop.
- Connectivity: Wi-Fi and Bluetooth should work immediately. If mobile data fails, you may need to manually re-enter your APN settings in the Network menu.
What to Do if Samsung I9100 Galaxy S II Flash Fails
- Odin Displays “FAIL”:
- This usually indicates a mismatch between the firmware and the device model or region. Double-check your model number in Settings before trying again.
- Device Not Detected:
- Reinstall the drivers and restart your computer. Ensure you are in Download Mode and try a different USB cable.
- KG Lock / Knox Activation:
- This happens if a Samsung account was active or if non-official firmware was used. Sign out of all accounts before flashing. If already locked, you will likely need a professional tool.
- Post-Flash Boot Loop:
- Use recovery mode (Volume Up + Power) to perform a factory reset. This clears cache conflicts from the previous install.
Missing IMEI or Corrupt Baseband on Samsung I9100 Galaxy S II After Flashing?
A missing IMEI usually means the EFS partition—which holds your unique device ID and network settings—has been corrupted. You should only restore the original IMEI that came with the device, as changing it is illegal in many regions. You can use tools like ChimeraTool or BFT for this. Check your local laws first.
Video Guide: How to repair IMEI
Samsung I9100 Galaxy S II Firmware FAQ
Q1: Is it safe to flash during a power outage risk?
A: You should not flash your device if the power is unstable. If the computer shuts down during the process, the firmware write will be interrupted, which can leave the phone unbootable. I recommend using a laptop with a full battery if you have unreliable power.
Q2: What should I do if I encounter an FRP lock after flashing?
A: You can use our free Android apps launcher to bypass it. FRP occurs because a Google account was active during the flash. Removing the account before you start prevents this.
Q3: Can I use a Mac or Linux computer for this?
A: While Heimdall can be used on Mac or Linux, the steps on this page are specifically for Odin on Windows. For the easiest experience on a Mac, I suggest using Boot Camp or a Windows virtual machine.
Q4: Is this firmware compatible with other Samsung models?
A: No, it is not. This firmware is specifically for the Samsung I9100 Galaxy S II with the Samsung Exynos 4 Dual 4210 chipset. Using it on a different variant can cause severe system failure. Always confirm the model in Settings.
Q5: Can I go back to an older firmware version?
A: Downgrading is possible on some builds, but it often leads to security gaps and app crashes. If the latest version is not working well, leave a comment and I can help you find a better fix.
Q6: Will flashing void my warranty?
A: Restoring official stock firmware generally does not void the warranty since it returns the phone to factory specs. However, some systems log when the bootloader is touched. Check your terms with Samsung if you are worried.
Q7: My device is not detected by Odin. What should I do?
A: Reinstall the Samsung USB drivers and restart your computer. Try using a USB 2.0 port instead of USB 3.0 and disable your antivirus. If it still fails, tell me the exact error message in the comments.
Q8: Will flashing erase my data?
A: Yes, it will. Using Odin to flash restores the phone to its original state, including Android 2.3.4 (Gingerbread), upgradable to 4.1.2 (Jelly Bean), TouchWiz UI 4. All personal files and accounts are deleted, so back up everything first.
People Also Ask About Samsung I9100 Galaxy S II
What is the latest firmware version for Samsung I9100 Galaxy S II?
The most recent version available here is the latest version. There are 2 different builds hosted on this page. You can check the specifications table for the exact file sizes and Android versions.
Will flashing firmware on Samsung I9100 Galaxy S II erase my data?
Yes, it will. Flashing official stock firmware with Odin wipes all user data. All contacts, photos, and apps will be removed. Make sure you have a backup before you start.
How do I check my Samsung I9100 Galaxy S II model number before flashing?
You can find the model number “I9100” in Settings > About Phone. You can also see the model code in recovery mode by holding Volume Up + Power while the device is off.
Can flashing firmware fix a bricked Samsung I9100 Galaxy S II?
Yes, it can. If the device is stuck on a logo or bootlooping, flashing the stock firmware with Odin is the standard way to restore functionality. This is the same method used by professional technicians.
Samsung I9100 Galaxy S II Firmware, Final Notes
The process is complete. Your Samsung I9100 Galaxy S II is now running the official stock firmware and should be free of the software issues you were experiencing.
If you ran into an error or a step did not match your device, please describe it in the comments. I read and respond to every question.
I update this guide whenever new builds are released, so you can return here for the newest versions.
Browse all Samsung firmware downloads for more devices.
Disclaimer: Flashing stock firmware is done at your own risk. Follow the steps carefully. I cannot be held responsible for device damage, but I will do my best to help you troubleshoot any issues.
