Samsung Galaxy J1 4G SM-J120G Firmware

Last Updated: July 23, 2026

I have put together the necessary tools and files for the Samsung Galaxy J1 4G SM-J120G so you can restore it to working condition. This guide includes the correct Odin flash tool, drivers, and step-by-step instructions to fix bootloops, bypass FRP, or perform a clean reflash.

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Samsung Galaxy J1 4G SM-J120G Firmware (Flash File) Drivers, Tools & Guide

Flashing stock firmware with Odin is a standard procedure for the Samsung Galaxy J1 4G SM-J120G, and I have gathered the specific files you need to do it. Once you have the right firmware file for the Samsung Galaxy J1 4G SM-J120G and the correct Odin version, the process is straightforward.

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.

The stock firmware ships with Android 5.1.1 Lollipop (upgradeable to 6.0.1 Marshmallow), which determines the default apps, security features, and interface you will see after flashing. The Samsung Galaxy J1 4G SM-J120G was originally released in 2015, which means USB driver compatibility on newer Windows versions (10/11) may require manual installation rather than plug-and-play. There are 2 firmware files available for the Samsung Galaxy J1 4G SM-J120G on this page. Pick the one that matches your current Android version for the smoothest flash.

This page is maintained with the latest available firmware builds for the Samsung Galaxy J1 4G SM-J120G as they become available. We verified firmware file integrity across 2 independent sources to confirm these are authentic, unmodified stock ROMs.

Your Samsung Galaxy J1 4G SM-J120G 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.

This process restores the phone to its original factory state, which means all your personal data will be lost. That clean wipe is exactly what fixes persistent problems like bootloops, forgotten locks, Google account verification, battery drain, and system errors.

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Samsung Galaxy J1 4G SM-J120G Hard Reset Guide

To perform a factory reset on the Samsung Galaxy J1 4G SM-J120G without a computer, 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 wipes the Samsung Galaxy J1 4G SM-J120G to its factory settings. This resolves most software issues like lag or bootloops, but a full firmware flash is needed if the problem persists.

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Bypass Google Lock on Samsung Galaxy J1 4G SM-J120G

The quickest way to bypass the Google lock on the Samsung Galaxy J1 4G SM-J120G is to use a free Android apps launcher that lets you access settings during the setup wizard. 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.

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When Should You Flash Samsung Galaxy J1 4G SM-J120G?

You should flash the Samsung Galaxy J1 4G SM-J120G with Odin if you are dealing with a software problem like a bootloop or system crash.

• Fix startup loops, lagging, and freezing on your device.
• Remove persistent malware or adware that survives a factory reset.
• Clear a forgotten screen lock, PIN, or pattern without needing the original credentials.
• Update to the latest Android version supported by your phone.
• Fix Wi-Fi, Bluetooth, or mobile data connectivity that stopped working after an update.
• Resolve touchscreen responsiveness issues caused by a corrupted system build.
• 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.

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How to Pick the Correct Samsung Galaxy J1 4G SM-J120G Firmware

Picking the wrong firmware is the most common mistake when working on the Samsung Galaxy J1 4G SM-J120G, so verify your model before downloading.

1. Identify Your Exact Model Number: Go to Settings › About Phone and note your full model number (e.g. SM-J120G). 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.
2. 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).
3. 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.
4. 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).
5. 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.

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Firmware Details for Samsung Galaxy J1 4G SM-J120G

Here is a quick overview of the official firmware specifications:

Firmware Information	Details
Device Model	Samsung Galaxy J1 4G SM-J120G
Firmware Version	DDU2ARD1
File Size	1 GB to 1.04 GB
Android Version	Android 5.1.1 Lollipop (upgradeable to 6.0.1 Marshmallow)
Platform	Samsung Exynos 3 Quad 3475
Release Date	Released 2015, March
Region	SM
File Type	.tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)

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Which Firmware Version Should I Download?

Use this table to decide which firmware file is right for your specific situation with the Samsung Galaxy J1 4G SM-J120G.

Your Situation	What I Recommend
Phone is completely dead or stuck on logo	DDU2ARD1, download this one. It is the latest Samsung Galaxy J1 4G SM-J120G 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 DDU2ARD1 first, then follow the IMEI repair guide. Do not skip the reflash.
DDU2ARD1 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	DDU2ARD1, 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.

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Download Samsung Galaxy J1 4G SM-J120G Firmware

Download the official stock firmware for your Samsung Galaxy J1 4G SM-J120G below. The latest available version is DDU2ARD1. 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: J120GDDU2ARD1_J120GODD2ARC1_INS.zip Size: 1 GB	Download Link	Download Link2

File Name: SM-J120G_1_J120GODD2ARD1.zip Size: 1.04 GB

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 Galaxy J1 4G SM-J120G (SM-J120G) should not be confused with other Galaxy J1 4G variants that may have different chipsets or regional firmware. Even devices in the same Galaxy J1 4G line can use completely different processors. Always verify your exact model code “SM-J120G” in Settings > About Phone before downloading any firmware from this page.

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Samsung Galaxy J1 4G SM-J120G Flash Setup Checklist

Go through this list before you open Odin for the Samsung Galaxy J1 4G SM-J120G. 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.

1. Save Your IMEI Numbers: Type *#06# in the phone dialer and note down both numbers. These are your device identifiers for the cellular network. If flashing wipes them, you will need the originals to write them back.
2. Disconnect Google Accounts: Before you start, remove all Google accounts from the phone. Settings then Accounts then tap each Google account and remove it. This avoids the FRP verification screen that appears after flashing if accounts were still linked.
3. Remove Samsung Accounts: Sign out of all Samsung accounts to avoid KG lock.
4. Create a Backup: Copy your data to your computer or an SD card. Flashing replaces the entire software on the phone, which means all personal data, apps, and settings will be permanently deleted.
5. Charge First: Get the battery above 50% before starting. The flashing process takes a few minutes and the first boot takes several more. A power failure during either stage can leave the device in a state that requires more advanced recovery.
6. Prepare Your PC Connection: You need a Windows computer and a USB cable that supports data transfer. Test the cable first by connecting the phone normally, if it shows up in File Explorer, the cable is good.
7. Install the Right Drivers:
   • Samsung USB Drivers

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Samsung Galaxy J1 4G SM-J120G Firmware Installation Guide

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.

1. Download the Firmware Package:
   • Use the download links in the table above to get the correct firmware file for your device.
   • Extract the archive with WinRAR or 7-Zip. Use a short folder path like D:flash to avoid issues with some tools.
2. Check Drivers:
   • All drivers from the prerequisites must be installed before connecting your device. Restart your computer after installing them.
3. 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.
4. 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.
5. Start Flashing:
   • Press “Start” to begin writing the firmware to your device.
   • Do not unplug the phone, close the flash tool, or interact with the device until the process is 100% complete.
6. Wait and Reboot:
   • After the tool confirms the flash is complete, safely disconnect your phone.
   • Press the power button to start your device. The initial boot is slow, wait up to 8 minutes before assuming there is a problem.

Video Guide for Flashing

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Normal Behavior After Installing Samsung Galaxy J1 4G SM-J120G Firmware

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.
• First boot takes 3 to 8 minutes, do not force-reboot the device. The operating system is setting itself up from scratch. Interrupting this is how devices end up in bootloops.
• 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.
• 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.
• 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.
• 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.
• All your apps are gone, this is expected. Reinstall them from the Play Store. If you had a Google account backup active, it will offer to restore your apps automatically during setup.

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Common Issues When Flashing Samsung Galaxy J1 4G SM-J120G

1. 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.
2. Samsung Galaxy J1 4G SM-J120G 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.
3. 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.
4. 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.

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Missing IMEI or Corrupt Baseband on Samsung Galaxy J1 4G SM-J120G After Flashing?

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

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Samsung Galaxy J1 4G SM-J120G Flashing FAQ

Q1: Is this firmware compatible with other Samsung models?
A: No. This firmware is built specifically for the Samsung Galaxy J1 4G SM-J120G running on the Samsung Exynos 3 Quad 3475 chipset. Even variants of the Galaxy J1 4G 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.

Q2: 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.

Q3: 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.

Q4: Will flashing erase my data?
A: Yes, flashing with Odin restores the device to factory state, including Android 5.1.1 Lollipop (upgradeable to 6.0.1 Marshmallow) 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.

Q5: Can I use a Mac or Linux computer for this?
A: Samsung firmware can be flashed using Heimdall on Linux or Mac, but the instructions on this page are written for Odin on Windows. If you only have a Mac, you may want to use a Windows virtual machine or Boot Camp for the most straightforward experience.

Q6: 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.

Q7: How long does the flashing process take?
A: The actual flash usually takes between 3 and 10 minutes depending on the firmware size and USB connection speed. The first boot after flashing takes another 3 to 8 minutes. Do not interrupt the device during either stage. If the progress bar in Odin appears stuck, give it a few more minutes before assuming something went wrong.

Q8: Is it safe to flash during a power outage risk?
A: It is best to avoid flashing during unstable power conditions. If your PC shuts down during the flash, it can corrupt the write and leave the phone in an unbootable state. If you are in an area with unreliable power, use a laptop with a fully charged battery instead of a desktop.

People Also Ask About Samsung Galaxy J1 4G SM-J120G

What is the latest firmware version for Samsung Galaxy J1 4G SM-J120G?
The latest available Samsung Galaxy J1 4G SM-J120G firmware on this page is version DDU2ARD1. This page has 2 firmware builds available for download. Check the firmware details table above for file sizes and Android versions.

Will flashing firmware on Samsung Galaxy J1 4G SM-J120G erase my data?
Yes. Flashing stock firmware on the Samsung Galaxy J1 4G SM-J120G 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 Galaxy J1 4G SM-J120G model number before flashing?
Go to Settings > About Phone on your Samsung Galaxy J1 4G SM-J120G and look for the model number “SM-J120G”. 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 Galaxy J1 4G SM-J120G?
Yes. If your Samsung Galaxy J1 4G SM-J120G 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.

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Summary

You have all the steps to flash the Samsung Galaxy J1 4G SM-J120G back to stock. The process is straightforward as long as you follow the steps in order and do not skip the driver installation.

Got stuck somewhere? Drop a comment with the error message and the step number. I check comments regularly and will point you in the right direction.

If this worked for you, share the page so others with the same device can find it too.

Browse all Samsung firmware downloads for more devices.

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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.