Samsung SM-T350 Firmware: How to Flash & Update

The Samsung SM-T350 is the Wi-Fi-only model of the Galaxy Tab A 8.0 (2015). Its firmware is the official Android operating system image that Samsung releases for this specific tablet, and knowing which version to use and how to install it is essential for updating, fixing boot loops, or removing carrier bloatware. This article explains what SM-T350 firmware is, where to find it, how to flash it safely, and what to do when things go wrong.

What Is the SM-T350 Firmware?

Firmware for the SM-T350 is the low-level software that controls the tablet’s hardware and provides the Android user interface. Samsung packages it as a single compressed file (usually with a .tar.md5 or .tar extension) that contains several partitions: the Android system, kernel, recovery, and modem (though Wi-Fi models have no cellular modem). Samsung releases these images for two reasons: to push new Android versions and security patches, and to allow repair of a tablet that is stuck, slow, or corrupted.

Unlike a simple OTA (over-the-air) update, a full firmware file can be flashed with a PC tool called Odin. This restores the tablet to a known, clean state, even if the operating system is completely broken. For the SM-T350, the final official Android version is Android 7.1.1 Nougat, with Samsung’s TouchWiz interface. There is no official Android 8 or newer from Samsung for this model, though custom ROMs exist.

How to Check Your Current Firmware Version

Before you download anything, you need to know what firmware you are currently running. This matters because Odin will sometimes refuse to downgrade, and because a wrong regional version can cause Wi-Fi or battery issues. To find your current version:

Go to Settings > About device > Software info.
Look at the Baseband version (may show “Unknown” on a Wi-Fi model) and the Build number.
The build number contains a 5-letter code that identifies the exact firmware, e.g., T350XXU1CQI1. The first three letters after T350 indicate the region and version.

You can also enable Developer Options and check the same info there. Write it down; you will need it to match the correct firmware file.

How to Find the Correct Firmware File

There are two reliable sources for SM-T350 firmware: Samsung’s own update servers (via Smart Switch) and third-party firmware archives. Samsung’s Smart Switch PC application can download and install the correct firmware for your device automatically, but it only offers the latest version for your region. If you need an older version or a specific country’s build, sites like SamMobile or Sammobile’s mirror (or similar community archives) host the files. When downloading from any site, always match the model number exactly (SM-T350, not SM-T350N or SM-T355) and check the region code.

To use Smart Switch:

Install Smart Switch on your PC.
Connect the tablet via USB and select “Device initialization.”
Enter your device model and serial number (found in Settings > About device).
It will download the correct firmware and attempt to install it.

This method is the safest because it automatically picks the right file. However, it will wipe your data, so back up first.

Flashing Firmware with Odin: Step-by-Step

Odin is the unofficial but widely used Windows tool for flashing Samsung firmware. It is not an official Samsung product, but it is the standard method for flashing full firmware packages. The process is straightforward, but a mistake can brick your tablet, so follow carefully.

Download Odin (a recent version, e.g., 3.13 or 3.14) and extract it to a folder.
Download the correct firmware for your SM-T350 and extract the .tar.md5 file (or .tar). Do not extract the contents further.
Enable USB debugging on the tablet (Settings > Developer options > USB debugging). If Developer options are hidden, tap “Build number” 7 times.
Power off the tablet. Then press and hold Volume Down + Home + Power to enter Download Mode. Confirm with Volume Up.
Open Odin as Administrator. Connect the tablet via USB. You should see an “Added!” message in the log box.
In Odin, click the AP button and select your firmware file. Do not touch BL, CP, or CSC unless you know exactly what you are doing.
Make sure Auto Reboot and F. Reset Time are checked. Leave “Re-Partition” unchecked.
Click Start. Wait until the log shows “PASS” in green. The tablet will reboot automatically.

If you see “FAIL” or the tablet stays on the Samsung logo, do not panic. The most common cause is a wrong firmware file (wrong model or region) or a bad USB cable. Re-download the file, try a different port, and repeat.

Common Problems and Their Fixes

Boot loop after flashing: Wipe the cache partition from recovery (Volume Up + Home + Power). If that fails, do a factory reset from recovery (this erases data).
Odin stuck at “SetupConnection”: Reinstall Samsung USB drivers, try a different cable, or close Kies/Smart Switch.
“SW REV CHECK FAIL” error: You are trying to downgrade to a version older than the one that is currently on the device. Samsung blocks downgrades. You must flash the same or a newer version.
Wi-Fi not working after flash: This often happens if you flashed a firmware from a different region that has a different Wi-Fi regulatory configuration. Flash the correct region’s firmware.
Tablet does not turn on at all: Charge it for 30 minutes, then try Download Mode again. If still dead, you may need a professional repair.

Always back up your data before flashing, because a full firmware flash wipes the internal storage.

Risks and Safety Precautions

Flashing firmware carries real risks. If you interrupt the process (e.g., unplug the USB cable) or flash a file meant for a different device, you can permanently damage the tablet’s bootloader. This is called “bricking.” To minimize risk:

Use a PC with a stable power supply and a good quality USB cable.
Never unplug the tablet during the flash.
Only use firmware files that are specifically for the SM-T350.
Do not flash a carrier-specific firmware (like Verizon or AT&T) on a Wi-Fi model, as it may not boot.
Understand that flashing voids your warranty and is done at your own risk.

If you are not comfortable with Odin, use Smart Switch’s “Device initialization” instead, as it is officially supported and less likely to fail.

Frequently Asked Questions

Can I install a newer Android version than 7.1.1 on my SM-T350?

Officially, no. Samsung stopped at Android 7.1.1 for this model. However, you can install custom ROMs like LineageOS (based on Android 9 or 10) if you unlock the bootloader and install a custom recovery. This is a more advanced process and carries additional risk, but it can give you a newer Android experience.

Will flashing firmware delete my data?

Yes, a full firmware flash via Odin wipes the data partition. Your apps, photos, and settings will be erased. You should back up everything important before flashing. The only exception is if you use the “CSC” option (home_csc) which preserves data, but that is not recommended for major version changes.

What does “SW REV CHECK FAIL” mean?

It means the firmware you are trying to flash has a lower version number than the one currently installed. Samsung has implemented a bootloader version check that prevents downgrading. You must flash a firmware with the same or higher revision number (the last letter in the build number, e.g., CQI1 is newer than CQH1).

Can I flash firmware with a Mac or Chromebook?

Odin is Windows-only. For Mac, you can use a virtual machine running Windows, or use Heimdall, a cross-platform alternative. Heimdall is less user-friendly and requires command-line knowledge. Most users find it easier to borrow a Windows PC or use Smart Switch, which has a Mac version.

Why does my tablet show “Custom binary blocked by FRP lock”?

This happens when you try to flash a non-official firmware and the Factory Reset Protection (FRP) is enabled. FRP is a security feature that locks the device if a Google account was previously signed in. To unlock, you must enter the Google account credentials that were used on the tablet. If you forgot them, you may need to bypass FRP using a separate tool, which is not recommended for security reasons.

Is it safe to download firmware from third-party sites?

It can be safe if you choose reputable sites like SamMobile, but there is always a risk of malware or corrupted files. Always scan downloaded files with antivirus software and verify the file size matches the site’s description. The safest method is to use Samsung Smart Switch, which downloads directly from Samsung’s servers.

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