- TVs
- Smart TV
USB error icon
Samsung Smart TV USB error icon: USB firmware update failed
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
The USB error icon (When the TV shows only a USB error message) on 2020 Samsung Kant-SU2 and Kant-S2 Smart TVs appears if the USB drive is removed before the second update reboot finishes. Do not unplug the power cord: reinsert the same USB stick so the update finishes.
Safety first
Stop and check this first
- Do not unplug the power cable, turn off the TV, or remove the USB memory drive until the second reboot is complete: Samsung states that doing so may cause a firmware error or main board failure that is not covered by the Samsung warranty policy.
- Only use official firmware downloaded from samsung.com for your exact model on a FAT32 USB drive, and never open the television yourself.
Safe checks you can perform
- Keep the TV powered on and reinsert the same firmware USB drive
- Verify the unzipped firmware folder on a FAT32 USB drive using a PC
- Confirm T-KTSU2 or T-KTS2 software version in About TV after recovery
Leave these tasks to a qualified professional
- Do not attempt this professional task: Complete USB firmware recovery with official Samsung Support guidance
- Do not attempt this professional task: Diagnose firmware error or main board failure with authorised Samsung service
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Complete USB firmware recovery with official Samsung Support guidance
What they doIf the television remains on the USB error icon after reinserting the FAT32 USB stick with the official unzipped firmware package, contact Samsung Support to verify the exact model package and recovery steps.
They must show youthe on-screen USB error icon, the model code on the TV rating label, and the files on the USB drive.
In writingthe verified model and serial number, the firmware package version tested, and the outcome after reinserting the USB drive.
Diagnose firmware error or main board failure with authorised Samsung service
What they doIf power was disconnected during the update and the TV cannot recover when the USB drive is reinserted, book an inspection with an authorised Samsung service centre without opening the TV casing at home.
They must show youthe TV boot symptom, the rear model and serial number label, and the technician's diagnostic findings.
In writingwhat was tested on the firmware and main board, the warranty coverage determination, and any component replaced.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Keep the TV powered on and reinsert the same firmware USB drive
- Who:
- TV owner without unplugging the mains power cable.
- How:
- While the TV remains on and displays the USB error icon, plug the same USB memory drive containing the latest firmware update file back into the TV's USB slot and wait for the update to resume.
- Result that matters:
- The TV reads the update file, displays the 30 to 60 second progress bar, performs the second reboot, and resolves the USB error icon automatically.
- If the TV finishes the second reboot and returns to normal viewing:
- leave the USB drive inserted until the TV is completely back on.
- If the USB error icon stays on screen after waiting several minutes with the drive inserted:
- check the USB files on a computer.
- Evidence to keep:
- Photo of the USB error icon on screen before reinserting the USB drive.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
Verify the unzipped firmware folder on a FAT32 USB drive using a PC
- Who:
- User with a computer and an empty USB flash drive.
- How:
- If the files on the stick were deleted or corrupted, format a USB drive to FAT32 on a PC, download the official upgrade file for your exact model from samsung.com, unzip it onto the drive with no other files, and insert it into the powered-on TV.
- Result that matters:
- The TV detects the valid update file on the FAT32 USB drive and completes the interrupted update.
- If the progress bar appears and the TV finishes its second reboot:
- verify the software version in the Support menu.
- If the screen remains stuck on the USB error icon:
- do not unplug the power cord and contact Samsung Support.
- Evidence to keep:
- Screenshot of the FAT32 USB drive contents showing the unzipped update file for the exact model.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models · Cómo actualizar el firmware de mi Samsung Smart TV mediante la unidad USB
Confirm T-KTSU2 or T-KTS2 software version in About TV after recovery
- Who:
- TV owner from the Support menu once normal picture is restored.
- How:
- After the second reboot finishes and the TV turns back on, open Settings > Support > About This TV (or About TV) to check the model code and software version (T-KTSU2 for Kant-SU2 or T-KTS2 for Kant-S2).
- Result that matters:
- Confirms the firmware update finished cleanly and the television is running the latest version.
- If the software version matches the latest release:
- you can safely remove the USB flash drive.
- If the TV fails to complete the update or stays on the error screen:
- contact authorised Samsung service.
- Evidence to keep:
- Photo of the About TV screen showing the model code and T-KTSU2 or T-KTS2 software version.
Evidence: Samsung TV or projector shows an error message · Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- TVs
- Brand
- Samsung
- Product type
- Smart TV
Known code variants
- Error de USB al actualizar Kant-SU2 y Kant-S2
- Ícono de error de USB
- Kant-S2 USB error
- Kant-SU2 USB error
- Mensaje de error de USB
- USB error message
- When the TV shows only a USB error message
What it means
On Samsung's official troubleshooting bulletin for 2020 TV models Kant-SU2 (software version T-KTSU2 in About TV) and Kant-S2 (T-KTS2), noting that other model families may differ, the screen displays only a USB error icon when the USB memory drive is unplugged before the firmware update finishes its required two-reboot sequence (first reboot, black screen for up to 10 seconds, 30 to 60 second progress bar, and second reboot). Seeing this icon alone never proves a hardware part is faulty.
Warnings and stop conditions
- Higheditorial warning
Do not unplug the power cable, turn off the TV, or remove the USB memory drive until the second reboot is complete: Samsung states that doing so may cause a firmware error or main board failure that is not covered by the Samsung warranty policy.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
- Mediumeditorial warning
Only use official firmware downloaded from samsung.com for your exact model on a FAT32 USB drive, and never open the television yourself.
Evidence: Samsung TV or projector shows an error message · Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
Symptoms and causes
Probable causes · in order
- Removing the USB flash drive before the second firmware update reboot completesCommon
On Kant-SU2 and Kant-S2 models, the final firmware update only completes after rebooting twice; pulling the USB stick out during the first reboot or black screen triggers the USB error icon.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
- Missing, zipped, or improperly formatted firmware package on the USB drivePossible
If the USB drive is not formatted in FAT32 or does not hold the unzipped update file for the exact TV model, the television cannot resume or verify the update.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models · Cómo actualizar el firmware de mi Samsung Smart TV mediante la unidad USB
- Unplugging the power cable or turning off the TV while the update is incompleteLess common
Cutting mains power while the USB error icon or update progress bar is active interrupts firmware writing and may cause a firmware error or main board failure.
Evidence: Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
Virtual technician
Does USB error icon still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Samsung TV or projector shows an error message
Samsung · 2026 · official_doc
- 2
Troubleshoot USB error messages when updating Kant-SU2 and Kant-S2 TV models
Samsung · 2020 · official_doc
- 3
Resuelve mensajes de error de USB al actualizar los modelos Kant-SU2 y Kant-S2
Samsung · 2025 · official_doc
- 4
Cómo actualizar el firmware de mi Samsung Smart TV mediante la unidad USB
Samsung · 2026 · official_doc
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