Last Updated: May 23, 2026
The Samsung Galaxy A31 SM-A315N, featuring the MediaTek MT6768 Helio P65 chipset, is a capable phone. If yours is experiencing software issues, you have landed in the right spot. This guide delivers the official Samsung Galaxy A31 SM-A315N firmware, along with all the necessary tools, drivers, and clear instructions to get your device operating smoothly again. We cover everything from flashing the firmware to performing hard resets, FRP bypasses, and even IMEI repair.
Device: Samsung Galaxy A31 SM-A315N | Chipset: MediaTek MT6768 Helio P65 | Flash Tool: Odin
Android: Android 12, One UI 4.1 | File Type: .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin)
⚠ Warning: Flashing erases all data. Back up first.
Samsung Galaxy A31 SM-A315N Firmware (Flash File) Drivers, Tools & Guide
Flashing official firmware on a Samsung Galaxy A31 SM-A315N using Odin is a reliable way to fix many software problems. Here, I have compiled the essential firmware files, the appropriate Odin flash tool, and a detailed guide to walk you through the entire process, ensuring a successful outcome.
Before you begin, a crucial step is to sign out of any Samsung account active on your device. Skipping this can trigger a KG lock, which adds complications. Samsung firmware packages typically come as a ZIP file containing .tar.md5 files for AP, BL, CP, and CSC (or HOME_CSC). After you extract the download, confirm these specific files are present; if not, you might have an incorrect firmware package.
The firmware for your Samsung Galaxy A31 SM-A315N arrives as a compressed ZIP archive. Make sure to download and extract it with a utility such as WinRAR or 7-Zip. Upon successful extraction, you will find files clearly labeled AP_*.tar.md5, BL_*.tar.md5, CP_*.tar.md5, and either CSC_*.tar.md5 or HOME_CSC_*.tar.md5. If these specific files are missing, it indicates you might have downloaded an incompatible package.
It is important to remember that applying stock firmware will wipe all data from your phone. This is by design, as a complete reset is often necessary to correct software glitches such as FRP locks, persistent application errors, sluggish performance, forgotten screen patterns, devices stuck on the logo, Wi-Fi and Bluetooth connectivity troubles, excessive battery drainage, and soft-bricked conditions.
Hard Reset Samsung Galaxy A31 SM-A315N
To perform a factory reset on your Samsung Galaxy A31 SM-A315N without needing a computer, completely power down the device. Next, simultaneously press and hold the Volume Up + Power buttons (for older models featuring a physical Home button, combine Volume Up + Home + Power) until the recovery menu loads. Navigate through the options using the volume keys and select “Wipe Data/Factory Reset,” then confirm your choice with the Power button.
Performing a hard reset clears all user data and returns the Samsung Galaxy A31 SM-A315N to its initial factory settings. This method typically resolves many common software problems, including slow operation, application malfunctions, forgotten screen lock passcodes, and devices stuck in a bootloop. Should the problem remain after a factory reset, a complete firmware flash with Odin, as detailed later in this guide, is the next step.
Samsung Galaxy A31 SM-A315N FRP Bypass
To quickly bypass FRP on your Samsung Galaxy A31 SM-A315N, try using a specific free Android apps launcher that grants access to system settings during the initial setup wizard. After a flash or factory reset, you might encounter a Google account verification screen, known as FRP. Our complimentary Android apps launcher offers an efficient solution. This is also why I always suggest removing your Google account prior to flashing, which prevents FRP from being an issue in the first place.
Why Do We Need Samsung Galaxy A31 SM-A315N Firmware?
Official firmware is essential for restoring Samsung devices, including the Samsung Galaxy A31 SM-A315N, via Odin, irrespective of their internal chipset. Whether you are facing boot-up problems or other software malfunctions, installing the correct official firmware can often provide a solution:
- Regain access to your device if it has become locked or disabled.
- Upgrade your phone to its most recent officially supported Android version.
- Address persistent startup loops, system slowdowns, and freezing on your SM-A315N Galaxy A31.
- Correct problems with over-the-air (OTA) update installations and excessive battery consumption.
- Revert to the original Samsung stock ROM, which helps maintain your device’s warranty status.
- Bring your device back to life if it is only booting into recovery mode.
- Fix issues like KG lock or Knox security triggers that might occur after an incorrect or incomplete firmware flash on your device.
Learn more about stock ROMs and why flashing works.
Choosing the Right Firmware Version
Before starting any flashing procedure, it is vital to double-check that you have the correct file. Using incompatible firmware can lead to significant problems that are hard to reverse:
- Identify Your Exact Model Number: Access Settings › About Phone to verify your full model number (e.g., SM-A315N). The trailing letter is important, U/U1 for USA, W for Canada, N for Korea, and B/F for International/Global variants. Applying firmware meant for a different variant can cause malfunctions.
- Match the CSC (Region): The three-letter region code embedded within the firmware filename should correspond to your device’s current CSC. You can find your current CSC by checking Settings › About Phone › Software Information or by looking at the Service Provider information displayed in Download Mode. Common codes include XAA (US), BTU (UK), INS (India), and SER (Russia).
- Check the Binary Level: Examine the version string of your current firmware (e.g.,
XXU9BZDP, the number directly after the letters indicates the binary level). Remember, you cannot downgrade to an older binary level. If your device is currently on Binary 9, you must only flash firmware that is Binary 9 or newer. - Confirm the Build Date: The final four characters of the PDA version string encode the firmware’s build date. The first of these characters represents the year (A=2024, B=2025, C=2026), and the second indicates the month (A=January through L=December).
- Verify in Download Mode: Power off your device, then press and hold Volume Down + Power to enter Download Mode. This screen provides precise details about your model, CSC, and current firmware version, which you should use to confirm compatibility before initiating the flash.
Firmware Details for Samsung Galaxy A31 SM-A315N
Below, you will find a summary of the official firmware specifications for the Samsung Galaxy A31 SM-A315N:
| Firmware Information | Details |
|---|---|
| Device Model | Samsung Galaxy A31 SM-A315N |
| Firmware Version | KSU1ATE4 |
| File Size | 51.2 MB to 3.9 GB |
| Android Version | Android 12, One UI 4.1 |
| Platform | MediaTek MT6768 Helio P65 |
| Release Date | Released 2020, April 27 |
| Region | Global, Africa and Asia |
| File Type | .tar.md5 / ZIP (Contains AP, BL, CP, CSC files for Odin) |
Which Firmware Version Should I Download?
This question comes up frequently in the comments, so I have created a straightforward guide. Locate your specific scenario in the table below and it will point you to the correct file:
| Your Situation | What I Recommend |
|---|---|
| Phone is completely dead or stuck on logo | KSU1ATE4, This is the most recent Samsung Galaxy A31 SM-A315N firmware available; it is a good starting point for recovery. |
| FRP / Google account lock only | See the FRP bypass guide above, a full firmware flash is typically not required for this specific issue. |
| Not sure which region/CSC to download | Verify your current CSC in Settings › About Phone › Software Information, or observe the CSC displayed on-screen when entering Download Mode (Volume Down + Power). Match this three-letter code (e.g., XAA, BTU, INS) to the firmware filename. |
| Phone slow after a recent OTA update | Try the next older version. Occasionally, the latest over-the-air update might introduce new performance bugs, and an earlier build could offer better stability. Ensure the binary level is identical to or newer than your device’s current level. |
| IMEI missing after a previous flash | Begin by re-flashing KSU1ATE4, then proceed with the IMEI repair guide. Re-flashing the firmware first is a critical step. |
| KSU1ATE4 failed with a flash error | Instead, attempt the next older version. Also, meticulously verify your AP/BL/CP/CSC file assignments in Odin before assuming the firmware itself is the problem. |
| Restoring to factory / warranty repair | KSU1ATE4, This provides a clean installation and a fresh start for your device. |
To determine the newer Samsung firmware version, examine the final four characters of the PDA version string (for instance, S938BXXU9CZDP). The initial character signifies the year (A=2024, B=2025, C=2026), the second represents the month (A=January through L=December, with Z indicating a final stable release), and the last two denote the revision (ranging from 0-9, then A-Z, where Z is the highest). However, prior to comparing dates, always confirm the binary level; this is the digit preceding the date code (e.g., XXU9CZDP indicates Binary 9). It is important to remember that you must not downgrade to a lower binary level. If your device is currently on Binary 9, you can only flash Binary 9 firmware or a newer version. Furthermore, verify that the three-letter CSC code within the firmware aligns with your device’s regional setting.
Download Samsung Galaxy A31 SM-A315N Firmware
You can download the official stock firmware for your Samsung Galaxy A31 SM-A315N from the links provided below. The most current version available is KSU1ATE4. Once your download completes, cross-reference the file size with the information in the table above. A discrepancy in size often points to an incomplete or corrupted download, and attempting to flash such a file can lead to more complications than it resolves.
| Software Details | Download Link | Members Link |
|---|---|---|
|
File Name: A315NKSU1ATE4_A315NOKR1ATE4_KOO_5file.zip Size: 3.9 GB | Download Link | Download Link2 |
| File Name: Root Samsung A31 SM-A315F SM-A315G SM-A315N Android 12.zip Size: 51.2 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.
- Your model number is a variant of SM-A315N with a different letter suffix. Carefully check About Phone, even a single letter difference can result in a failed or damaged flash.
- Your chipset differs from MediaTek MT6768 Helio P65. Confirm this 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 typically indicates a partial download, which will cause the flash to fail midway.
Prerequisites for Samsung Galaxy A31 SM-A315N Firmware
Before launching Odin for your Samsung Galaxy A31 SM-A315N, review this checklist. Common issues encountered with Samsung devices often stem from two main sources: a Samsung account that was not logged out prior to flashing, potentially activating KG lock, or a USB cable that functions for charging but fails to maintain a stable connection during the flashing process. Always use a reliable data-transfer USB cable, not one designed solely for charging.
- Back Up IMEI Numbers: Dial *#06# and carefully record both IMEI numbers. These will be necessary if you ever need to restore your IMEI after a flash.
- Remove Google Accounts: Log out of all Google accounts to prevent FRP lock from activating after the flashing procedure.
- Remove Samsung Accounts: Ensure all Samsung accounts are signed out to avoid triggering a KG lock.
- Back Up Your Data: Create a full backup of all your personal data, including photos, contacts, WhatsApp conversations, and essential files. Flashing will completely erase your device.
- Charge Your Device: The device should have at least 50% battery charge. A phone that loses power during a flash can become extremely difficult to recover.
- USB Cable & PC: Use a robust data-transfer USB cable (not just for charging) and a Windows computer with available USB ports.
- Install Required Drivers:
How to Install Firmware on Samsung Galaxy A31 SM-A315N
For this process, we will be using Odin. Here is a helpful hint: ensure that both “Auto Reboot” and “F. Reset Time” are selected within Odin. Combining these two settings generally leads to the most successful and clean flashing outcome. If you are uncertain about which Odin version is appropriate, our Odin versions page offers guidance, as certain older Samsung devices may perform better with earlier Odin builds.
- Download and Extract:
- Obtain the correct firmware package using the download links provided earlier.
- Decompress the ZIP file into a simple directory path. Avoid paths containing spaces or special characters, as some flashing tools may struggle with them.
- Install the Listed Drivers:
- Confirm that all drivers mentioned in the prerequisites section are installed and that your computer has rebooted since their installation. Forgetting to restart is a common reason for driver issues.
- Load the Firmware File:
- Inside Odin, click the “BL” button and choose the corresponding BL_*.tar.md5 file. Proceed to click “AP” and select the AP_*.tar.md5 file. Repeat this for “CP” and “CSC”. Use HOME_CSC if you wish to retain user data, or CSC for a complete factory reset.
- Connect Your Device:
- Enter Download Mode: Power off your phone, then hold Volume Down + Power (add the Home button for older models) until a warning screen appears. Press Volume Up to acknowledge and proceed into Download Mode.
- Connect your phone to your PC with a USB cable. Odin should display “Added..” in its log panel, confirming that your device is recognized.
- Start Flashing:
- Click the “Start” button in Odin to initiate the flashing process.
- It is critical not to disconnect the cable, move the device, or interact with it in any way until the procedure is fully finished. Interrupting a flash in progress is a common cause of hard bricks.
- Wait and Reboot:
- After the flashing successfully concludes, you may disconnect the device.
- Power on your phone. The initial boot after flashing will take longer than usual, allow up to 8 minutes for it to complete.
Video Guide for Flashing
What to Expect After Flashing Samsung Galaxy A31 SM-A315N Firmware
Many people reach out thinking a problem occurred after a flash when everything is actually proceeding as expected. Here is a list of completely normal behaviors you can anticipate following a successful Samsung Galaxy A31 SM-A315N firmware update:
- How to know the flash was successful: Odin will display “PASS.” in green text at the top-left of its log window. Seeing this indicates a smooth and successful operation.
- First boot takes 3 to 8 minutes, do not force a reboot of the device. The operating system is performing its initial setup from scratch. Interrupting this phase can lead to your device getting stuck in bootloops.
- The phone will feel warm during first boot, this is standard behavior. The temperature will stabilize after a few minutes once the initial application setup processes are complete.
- All your apps are gone, this outcome is expected. You will need to reinstall them from the Play Store. If you had an active Google account backup, the setup wizard will offer to restore your applications automatically.
- Dial *#06# immediately after setup to check your IMEI numbers right away, before you insert a SIM card. If it shows “unknown” or “null,” proceed to follow the IMEI repair guide below before taking any further action.
- Be careful when re-adding your Google account, if you did not remove it before flashing, you might encounter an FRP prompt. Add your Google account freshly during the device setup wizard, rather than through Settings later.
- Wi-Fi, Bluetooth, and mobile data should function correctly right after initial setup. If mobile data is not connecting, go to Settings › SIM and Network and manually re-enter your APN details. A firmware flash can sometimes clear previous carrier APN settings.
- Stuck in a bootloop after first boot? Access recovery mode and perform a factory reset from there, refer to the hard reset guide above. This can happen occasionally and does not necessarily mean the firmware is incorrect; it is typically due to conflicts with residual data from the previous installation.
- Samsung Smart Switch: After updating your Samsung Galaxy A31 SM-A315N firmware, Samsung Smart Switch might suggest installing additional updates. Allow these to complete, as they ensure your device receives the latest security patches specific to your region.
Missing IMEI or Corrupt Baseband on Samsung Galaxy A31 SM-A315N After Flashing?
If your Samsung device shows a missing IMEI after flashing, it frequently indicates damage to the EFS partition, which is responsible for storing your IMEI and network configurations. It is crucial to understand that restoring an IMEI that is not the device’s original number is illegal in most jurisdictions. Therefore, this procedure should only be performed to reinstate the IMEI that was present on your device before the flash. Specialized tools such as ChimeraTool or BFT can assist with this. Always verify your local laws before proceeding.
Video Guide: How to repair IMEI
Common Issues When Flashing Samsung Galaxy A31 SM-A315N
- Odin Shows “FAIL” Instead of “PASS”:
- This typically indicates an incompatibility between the firmware’s region or model and your specific device. Before selecting firmware, confirm your precise model number in Settings › About Phone. Even a minor difference in the model code can lead to a failed flash.
- Samsung Galaxy A31 SM-A315N Not Recognized by Odin:
- Reinstall the Samsung USB drivers. Ensure your device is actually in Download Mode. Try using a different USB cable, as Odin can sometimes be sensitive to cable quality.
- KG Lock / Knox Triggered After Flashing:
- This occurs when a Samsung account was still signed in on the device before flashing, or if unofficial firmware was used. Always log out of all Samsung accounts prior to flashing. If KG lock is already active, specialized unlocking tools are generally necessary.
- Boot Loop After Flashing:
- Enter recovery mode (Volume Up + Power) and execute a factory reset. This clears any lingering data from the previous firmware installation that might be causing a conflict.
Frequently Asked Questions
Q1: Will flashing the Samsung Galaxy A31 SM-A315N firmware erase my data?
A: Yes, using Odin to flash this firmware will reset your device to its factory configuration, including the default Android 12, One UI 4.1 settings. All personal data, such as applications, photographs, contacts, and linked accounts, will be removed. It is essential to back up everything important before you begin, as data cannot be recovered once the flashing process is complete.
Q2: Is this firmware compatible with other Samsung models?
A: No, this firmware is designed specifically for the Samsung Galaxy A31 SM-A315N, which utilizes the MediaTek MT6768 Helio P65 chipset. Even other Galaxy A31 variants with a different letter suffix (for example, SM-A315F) might feature entirely different internal hardware. Flashing incompatible firmware can render your phone unusable or very difficult to restore. Always confirm your exact model number by checking Settings › About Phone.
Q3: Can I downgrade from KSU1ATE4 to an older firmware version?
A: While technically feasible on some MediaTek-based builds, I do not advise downgrading. Reverting to an older version can introduce security vulnerabilities and cause application compatibility issues, especially when going back from Android 12, One UI 4.1. If KSU1ATE4 is causing problems, please leave a comment below, there is typically a better solution than rolling back.
Q4: What should I do if I encounter an FRP lock after flashing?
A: If you encounter an FRP lock on your Samsung Galaxy A31 SM-A315N after flashing, this usually means a Google account was still logged in before the process. You can use our free Android apps launcher as a solution. I always recommend signing out of your Google account beforehand to avoid this issue entirely.
Q5: Are custom ROM options available for the Samsung Galaxy A31 SM-A315N?
A: This guide specifically focuses on official Samsung stock firmware. The availability of custom ROMs for the Samsung Galaxy A31 SM-A315N depends on whether open-source kernel support exists for its MediaTek MT6768 Helio P65 chipset. For device-specific custom ROM discussions, I recommend checking our Custom ROMs page or visiting the XDA Developers forum.
Q6: My Samsung Galaxy A31 SM-A315N is not detected by Odin. What should I do?
A: Begin by reinstalling the Samsung USB drivers, then restart your computer, and attempt the connection again. If the problem persists, try connecting to a USB 2.0 port instead of USB 3.0, as Samsung devices often have more stable connections on the older standard. Temporarily disable your antivirus software. If these steps do not resolve the issue, please leave a detailed comment below outlining the exact error message and what you have already tried, and I will assist further.
Q7: How do I enter recovery mode on my Samsung Galaxy A31 SM-A315N?
A: To access recovery mode on your Samsung Galaxy A31 SM-A315N, ensure the device is fully powered off. Then, simultaneously press and hold the Volume Up + Power buttons until the recovery menu appears. For older Samsung models that feature a physical Home button, the combination is Volume Up + Home + Power. The recovery menu will display the build number, which is useful for verifying your Samsung Galaxy A31 SM-A315N firmware version before flashing.
Q8: My IMEI shows “unknown” after flashing the Samsung Galaxy A31 SM-A315N. Is my phone permanently damaged?
A: No, while alarming, this issue is generally repairable. You should consult the IMEI repair guide located in the troubleshooting section above. For Samsung devices, the primary suspect is usually a corrupted EFS partition. Critically, avoid inserting a SIM card until the IMEI has been successfully restored.
Q9: How long does it take to flash Samsung Galaxy A31 SM-A315N firmware?
A: The actual firmware flashing process typically ranges from 3 to 10 minutes, depending on the size of the firmware package and the speed of your USB connection. The subsequent first boot after flashing will take longer, usually between 3 and 8 minutes. It is crucial not to interfere with the device during either of these stages. If Odin’s progress bar seems to be stuck, allow a few extra minutes before assuming there is an error.
Final Thoughts on Samsung Galaxy A31 SM-A315N Firmware
This covers all the essential information to safely install the official Samsung Galaxy A31 SM-A315N firmware (KSU1ATE4) using Odin, restoring your device to full functionality. If you carefully followed each instruction, your phone should now be operating with a fresh, clean software build.
Should any part of this process not proceed as anticipated, perhaps you encountered a particular error, or a step is not working with your specific setup, please share a comment below. Provide as much detail as possible: the precise error message, your current step, and any troubleshooting you have already attempted. I review every comment and will assist you in resolving the issue.
If this guide proved useful to you, please consider sharing it. This is the most effective way to help others who might be experiencing similar device problems.
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.
