Last Updated: July 7, 2026
You can restore your Samsung I9105 Galaxy S II Plus GT-I9105P to working condition using the resources on this page. Download the stock firmware, grab the tools, and follow the guide. Troubleshooting and IMEI repair are covered too.
Device: Samsung I9105 Galaxy S II Plus GT-I9105P | Chipset: Broadcom BCM28155 | Flash Tool: Odin
Android: Android 4.1.2 (Jelly Bean), upgradable to 4.2.2 (Jelly Bean), TouchWiz UI 5 | File Type: .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)
⚠ Warning: Flashing erases all data. Back up first.
Device: Samsung I9105 Galaxy S II Plus GT-I9105P (Broadcom BCM28155)
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 I9105 Galaxy S II Plus GT-I9105P Firmware (Flash File) Drivers, Tools & Guide
Installing the Samsung I9105 Galaxy S II Plus GT-I9105P firmware requires Odin and the correct files. I have put everything together on this page: the right firmware file for the Samsung I9105 Galaxy S II Plus GT-I9105P, the correct Odin version, and the steps that work.
One thing to do before you start: if your device has a Samsung account signed in, sign it out before doing anything else. Knox will trigger if this step is skipped, and dealing with a KG lock after flashing takes extra time. Also, Samsung firmware comes in .tar.md5 format, after extracting the ZIP, you should see files named AP_*, BL_*, CP_*, and CSC_* (or HOME_CSC_*). If you do not see these, you have the wrong package.
Only one firmware build is currently available for the Samsung I9105 Galaxy S II Plus GT-I9105P. This is the stock ROM you should use for recovery, unbricking, or FRP bypass. The stock firmware ships with Android 4.1.2 (Jelly Bean), upgradable to 4.2.2 (Jelly Bean), TouchWiz UI 5, which determines the default apps, security features, and interface you will see after flashing. As a Samsung device, the Samsung I9105 Galaxy S II Plus GT-I9105P uses Odin for firmware installation. This is the same tool Samsung service centers use, and it works with all Galaxy devices regardless of chipset.
The Samsung I9105 Galaxy S II Plus GT-I9105P was released in 2013. This page is maintained with the latest available firmware builds as they become available. Samsung firmware uses a multi-file system (AP, BL, CP, CSC) specific to Odin-based flashing, which differs from single-file scatter-based tools.
Your Samsung I9105 Galaxy S II Plus GT-I9105P firmware comes as a compressed ZIP file. Download and extract it using WinRAR or 7-Zip. After extracting, you should see files named like AP_*.tar.md5, BL_*.tar.md5, CP_*.tar.md5, and CSC_*.tar.md5 (or HOME_CSC_*.tar.md5). If you do not see these files, you may have the wrong firmware package for your device.
A full flash will erase everything on the device: apps, accounts, photos, and settings. That is the point, it gives you a clean slate and resolves issues like screen locks, FRP prompts, dead boot states, sluggish performance, and connectivity problems.
Factory Reset Samsung I9105 Galaxy S II Plus GT-I9105P Without a PC
You can perform a factory reset on the Samsung I9105 Galaxy S II Plus GT-I9105P without a computer by using the recovery menu. Power off the device completely, then hold Volume Up + Power (for older models with a Home button, use Volume Up + Home + Power) at the same time until the recovery menu appears. Use the volume keys to navigate to “Wipe Data/Factory Reset” and confirm with the Power button.
A hard reset erases all data and restores Samsung I9105 Galaxy S II Plus GT-I9105P to its original factory state. This fixes most software problems, slow performance, app crashes, forgotten screen locks, and bootloops. If the issue persists after a factory reset, a full firmware flash using Odin is covered in the following sections.
Samsung I9105 Galaxy S II Plus GT-I9105P FRP Bypass
Bypassing the FRP lock on the Samsung I9105 Galaxy S II Plus GT-I9105P is possible using specific methods during the setup process. After flashing or performing a factory reset you may see a Google account lock (FRP). Our free Android apps launcher is the fastest way to get past it. This is also why I always recommend removing your Google account before flashing, it avoids this problem entirely.
Common Reasons to Reinstall Samsung I9105 Galaxy S II Plus GT-I9105P Firmware
You should reinstall the Samsung I9105 Galaxy S II Plus GT-I9105P firmware if you are facing specific software issues. Samsung devices like the Samsung I9105 Galaxy S II Plus GT-I9105P are flashed using Odin, regardless of the chipset inside. Whether you are dealing with a boot issue or a software problem, flashing the official firmware can resolve it:
- Fix Wi-Fi, Bluetooth, or mobile data connectivity that stopped working after an update.
- Restore system apps that were accidentally removed or corrupted.
- Repair a phone that shuts down randomly or restarts in a loop.
- Resolve touchscreen responsiveness issues caused by a corrupted system build.
- Fix startup loops, lagging, and freezing on your device.
- Unlock your device if it has been locked or disabled.
- Recover from KG lock or Knox-related issues after an incorrect or interrupted flash on your device.
Learn more about stock ROMs and why flashing works.
Verify Your Samsung I9105 Galaxy S II Plus GT-I9105P Model Before Downloading
Always verify your exact device model before downloading firmware for the Samsung I9105 Galaxy S II Plus GT-I9105P. The single biggest mistake I see people make is flashing firmware meant for a different variant. Before downloading anything, verify your exact device identity:
- Identify Your Exact Model Number: Go to Settings › About Phone and note your full model number (e.g. GT-I9105P). The letter suffix matters, U/U1 = USA, W = Canada, N = Korea, B/F = International/Global. Flashing firmware built for a different variant can cause issues.
- Match the CSC (Region): The 3-letter region code in the firmware filename must match your device. Check Settings › About Phone › Software Information for your current CSC, or look at the Service Provider line in Download Mode. Common codes: XAA (US), BTU (UK), INS (India), SER (Russia).
- Check the Binary Level: Look at the version string in your current firmware (e.g.
XXU9BZDP, the number after the letters is the binary level). You cannot downgrade to a lower binary level. If your device is on Binary 9, only flash Binary 9 or higher firmware. - Confirm the Build Date: The last 4 characters of the PDA version encode the build date, first character is the year (A=2024, B=2025, C=2026), second is the month (A=Jan through L=Dec).
- Verify in Download Mode: Power off, hold Volume Down + Power to enter Download Mode. This screen shows your exact model, CSC, and current firmware version, use this to confirm before flashing.
Firmware Details for Samsung I9105 Galaxy S II Plus GT-I9105P
Here is a quick overview of the official firmware specifications:
| Firmware Information | Details |
|---|---|
| Device Model | Samsung I9105 Galaxy S II Plus GT-I9105P |
| Firmware Version | N/A |
| File Size | 978.6 MB |
| Android Version | Android 4.1.2 (Jelly Bean), upgradable to 4.2.2 (Jelly Bean), TouchWiz UI 5 |
| Platform | Broadcom BCM28155 |
| Release Date | Released 2013, February |
| Region | Global, Africa and Asia |
| File Type | .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin) |
Which Firmware Version Should I Download?
Use the table below to determine which firmware version you need for your Samsung I9105 Galaxy S II Plus GT-I9105P. This is the question I get asked most often in the comments, so I put together a simple guide. Find your situation in the table and go straight to the right file:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | the latest version, download this one. It is the latest Samsung I9105 Galaxy S II Plus GT-I9105P 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 tell which Samsung firmware is newer, look at the last 4 characters of the PDA version string (e.g. S938BXXU9CZDP). The first character is the year (A=2024, B=2025, C=2026), the second is the month (A=Jan, B=Feb… L=Dec, Z=final stable), and the last two are the revision (0-9 then A-Z, where Z is highest). But before comparing dates, always check the binary level: the digit just before the date code (e.g. XXU9CZDP = Binary 9). You cannot downgrade to a lower binary level. If your device is on Binary 9, only flash Binary 9 or higher. Also make sure the 3-letter CSC code in the firmware matches your device region.
Download Samsung I9105 Galaxy S II Plus GT-I9105P Firmware
You can download the latest Samsung I9105 Galaxy S II Plus GT-I9105P firmware files from the links below. The latest available version is the latest version. After downloading, verify the file size matches the table above, a size mismatch usually means a partial or corrupt download, and flashing a corrupt file can cause more problems than it solves.
| Software Details | Download Link | Members Link |
|---|---|---|
|
File Name: I9105PXXUBOB2_I9105POXXBOC1_XEF.zip Size: 978.6 MB | Download Link | Download Link2 |
Only download firmware that is fully compatible with your exact device model. See the firmware selection guide above if you are not sure.
Important: The Samsung I9105 Galaxy S II Plus GT-I9105P (GT-I9105P) should not be confused with other I9105 Galaxy S II Plus variants that may have different chipsets or regional firmware. Even devices in the same I9105 Galaxy S II Plus line can use completely different processors. Always verify your exact model code “GT-I9105P” in Settings > About Phone before downloading any firmware from this page.
- Your model number is a variant of GT-I9105P with a different letter suffix. Check About Phone carefully, one letter difference can cause a failed or broken flash.
- Your chipset differs from Broadcom BCM28155. Confirm in recovery mode before proceeding.
- You downloaded the file from a source other than this page.
- The file size differs significantly from the sizes listed in the table above, a size mismatch usually means a partial download, which will fail mid-flash.
Prerequisites for Samsung I9105 Galaxy S II Plus GT-I9105P Firmware
Make sure you have the necessary tools and files before starting the installation process for the Samsung I9105 Galaxy S II Plus GT-I9105P. Two things that commonly cause problems with Samsung devices: a Samsung account that was not signed out before flashing, which can trigger KG lock, and a USB cable that works for charging but drops the connection mid-flash. Always use a proper data cable, not a charge-only cable.
- Record IMEI Before Flashing: Dial *#06# and save both IMEI numbers somewhere safe, a screenshot works. If flashing corrupts the baseband, these numbers are what you will need to restore cellular connectivity.
- Unlink Google Accounts: Go to Settings, then Accounts, and remove all Google accounts. This prevents Factory Reset Protection from activating after the flash. It is the single most skipped step and causes the most post-flash headaches.
- Remove Samsung Accounts: Sign out of all Samsung accounts to avoid KG lock.
- Full Data Backup: Flashing erases everything. Transfer your photos, contacts, app data, and any important files to your computer or cloud backup before starting.
- Charge the Battery: Make sure you have at least 50% charge. A dead battery during a flash can corrupt the system partition and turn a fixable problem into a much bigger one.
- Windows PC and USB Cable: You will need a Windows computer and a data-capable USB cable. Cheap charge-only cables are the number one reason flash tools fail to detect devices.
- Driver Installation:
Install Stock Firmware on Samsung I9105 Galaxy S II Plus GT-I9105P
Follow these steps to install the stock firmware on your Samsung I9105 Galaxy S II Plus GT-I9105P using Odin. We are using Odin for this. A quick tip: keep “Auto Reboot” and “F. Reset Time” both checked in Odin, those two options together give you the cleanest flash result. If you are not sure which Odin version to use, check our Odin versions page. Some older Samsung devices work better with older Odin builds.
- Download and Extract:
- Download the correct firmware package from the links above.
- Extract the ZIP to a simple folder path, avoid paths with spaces or special characters, as some flash tools have trouble with them.
- Install the Listed Drivers:
- Confirm all drivers listed above are installed and that your PC has been restarted since installation. Skipping the restart is a common reason drivers do not work correctly.
- Load the Firmware File:
- In Odin, click “BL” and select the BL_*.tar.md5 file. Click “AP” and select the AP_*.tar.md5 file. Repeat for “CP” and “CSC”. Use HOME_CSC to keep data, or CSC for a clean flash.
- Connect Your Device:
- Enter Download Mode: Turn off your phone, then hold Volume Down + Power (add Home button on older models) until the warning screen appears. Press Volume Up to confirm and enter Download Mode.
- Connect your phone to your PC via USB. Odin should show “Added..” in the log area, this means your device is detected.
- Start Flashing:
- Click the “Start” button to begin.
- Do not disconnect, move the cable, or touch the device until the process is fully complete. Disconnecting mid-flash is how devices get bricked.
- Wait and Reboot:
- Once flashing finishes successfully, disconnect the device.
- Power on your device. The first boot will take longer than usual, give it up to 8 minutes.
Video Guide for Flashing
Post-Flash Behavior on Samsung I9105 Galaxy S II Plus GT-I9105P
Expect the following behavior after successfully flashing the Samsung I9105 Galaxy S II Plus GT-I9105P. Here is what is completely normal after a successful flash:
- How to know the flash was successful: Odin will show “PASS.” in green text at the top-left of the log area. If you see this, everything went fine.
- The phone may ask for language and region again, this is normal after a flash. You are starting from a clean state, so the setup wizard runs just like when the phone was brand new.
- Storage will show almost full capacity available since all your apps and files are gone. The system partition size varies by firmware version but is typically 4 to 8 GB on most devices.
- Stuck in a bootloop after first boot? Enter recovery mode and do a factory reset from there, see the hard reset guide above. This can happen occasionally and does not mean the firmware is wrong.
- Fingerprint and face unlock data are erased during the flash. You will need to re-register your fingerprints and face data from scratch in the security settings.
- Be careful when re-adding your Google account, if you did not remove it before flashing, you may see an FRP prompt. Add it fresh during the setup wizard, not afterwards through Settings.
- Wi-Fi, Bluetooth, and mobile data should all work right after setup. If mobile data is not connecting, go to Settings, SIM and Network, and re-enter your APN manually, the flash sometimes clears carrier APN settings.
Samsung I9105 Galaxy S II Plus GT-I9105P Flashing Problems and Fixes
- Odin Shows “FAIL” Instead of “PASS”:
- This is usually a mismatch between the firmware region or model and your device. Confirm your exact model number in Settings › About Phone before selecting the firmware. Even a single letter difference in the model code matters.
- Samsung I9105 Galaxy S II Plus GT-I9105P Not Recognized by Odin:
- Reinstall the Samsung USB drivers. Make sure you are in Download Mode. Try a different USB cable, Odin can be sensitive to cable quality.
- KG Lock / Knox Triggered After Flashing:
- This happens when a Samsung account was still signed in before flashing, or when unofficial firmware was used. Always sign out of Samsung accounts before flashing. If KG lock is already active, a professional unlocking tool is generally needed.
- Boot Loop After Flashing:
- Enter recovery mode (Volume Up + Power) and perform a factory reset. This clears any leftover data from the previous firmware that may be causing the conflict.
Missing IMEI or Corrupt Baseband on Samsung I9105 Galaxy S II Plus GT-I9105P After Flashing?
You can fix a missing or corrupt IMEI on the Samsung I9105 Galaxy S II Plus GT-I9105P using specialized tools. A missing IMEI on a Samsung device after flashing usually points to a corrupted EFS partition, this is the partition that stores your IMEI and carrier settings. Note that restoring an IMEI that is not your original number is illegal in most countries, so only do this if you are restoring the number the device had before you flashed. Tools like ChimeraTool or BFT can help with this. Check your local laws before proceeding.
Video Guide: How to repair IMEI
Frequently Asked Questions
Q1: Will flashing void my warranty?
A: Flashing official stock firmware generally does not void your warranty since you are restoring the device to its factory-intended state. However, some manufacturers may flag that the bootloader was unlocked or that the flash counter increased. Check your specific warranty terms with Samsung support if you are concerned.
Q2: Can I flash this firmware if my phone does not turn on at all?
A: Yes, in most cases. Samsung devices can usually enter Download Mode even when the screen is completely dead, hold Volume Down + Power for 10 seconds. If the battery is completely drained, charge it for at least 15 minutes first.
Q3: My IMEI shows “unknown” after flashing. Is my phone permanently damaged?
A: No, it looks alarming, but it is fixable. Follow the IMEI repair guide in the troubleshooting section above. For Samsung devices, check for EFS partition corruption first. Do not insert a SIM card until the IMEI is restored.
Q4: Is this firmware compatible with other Samsung models?
A: No. This firmware is built specifically for the Samsung I9105 Galaxy S II Plus GT-I9105P running on the Broadcom BCM28155 chipset. Even variants of the I9105 Galaxy S II Plus with a different letter suffix can have a completely different chipset inside. Flashing the wrong firmware can leave your phone in a state that is very difficult to recover from. Always check your exact model number in Settings.
Q5: What if the flash fails halfway through?
A: Do not panic and do not disconnect the phone. Close Odin, restart it, and try the flash again from the beginning. In most cases, a failed flash just means the process needs to be repeated. The device is usually still detectable by the flash tool even after a failed attempt.
Q6: My device is not detected by Odin. What should I do?
A: Start with the drivers, reinstall the Samsung USB drivers, restart your PC, then try again. Switch to a USB 2.0 port if you are on USB 3.0. Disable your antivirus temporarily. If none of that works, leave a comment with the exact error message.
Q7: How do I enter recovery mode?
A: Power the device off completely, then hold Volume Up + Power at the same time until the recovery menu appears. For older Samsung models with a physical Home button, use Volume Up + Home + Power. The recovery menu displays the build number which you can use to verify your firmware version before flashing.
Q8: Will flashing erase my data?
A: Yes, flashing with Odin restores the device to factory state, including Android 4.1.2 (Jelly Bean), upgradable to 4.2.2 (Jelly Bean), TouchWiz UI 5 default settings. All apps, photos, contacts, and accounts will be removed. Back up everything you need before you start. There is no way to recover data once the flash is complete.
People Also Ask About Samsung I9105 Galaxy S II Plus GT-I9105P
What is the latest firmware version for Samsung I9105 Galaxy S II Plus GT-I9105P?
The latest available Samsung I9105 Galaxy S II Plus GT-I9105P firmware on this page is version the latest version. This page has 1 firmware build available for download. Check the firmware details table above for file sizes and Android versions.
Will flashing firmware on Samsung I9105 Galaxy S II Plus GT-I9105P erase my data?
Yes. Flashing stock firmware on the Samsung I9105 Galaxy S II Plus GT-I9105P with Odin performs a full factory reset. All apps, photos, contacts, and accounts will be removed. Back up everything important before you start. There is no way to recover data after flashing.
How do I check my Samsung I9105 Galaxy S II Plus GT-I9105P model number before flashing?
Go to Settings > About Phone on your Samsung I9105 Galaxy S II Plus GT-I9105P and look for the model number “GT-I9105P”. You can also confirm by entering recovery mode (Volume Up + Power while powered off) which displays the build number and model code. Always match this exactly with the firmware filename before flashing.
Can flashing firmware fix a bricked Samsung I9105 Galaxy S II Plus GT-I9105P?
Yes. If your Samsung I9105 Galaxy S II Plus GT-I9105P is stuck on the logo, in a bootloop, or will not turn on, flashing the stock firmware with Odin can restore it to working condition. This is the standard repair method used by service centers for Samsung devices.
Conclusion
That covers the entire flashing process for the Samsung I9105 Galaxy S II Plus GT-I9105P. With the latest version installed, your device should boot cleanly and be ready for setup.
If you ran into an issue that is not covered here, or if one of the steps did not work the way it should, let me know in the comments. Include the error code or screenshot if you have one.
Bookmark this page if you work on Samsung devices regularly. I keep it updated when new firmware versions come out.
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.
