Samsung Knox Warranty Check Guide
Samsung Knox is a unique security feature that permanently records if a phone has been modified. Learn how to check Knox warranty status and why it's critical when buying a used Samsung.
What is Samsung Knox?
Samsung Knox is a defense-grade security platform built into Samsung smartphones at the hardware level. It provides secure boot, real-time kernel protection, and trusted execution environments for sensitive operations like Samsung Pay, Secure Folder, and enterprise data protection.
One of the most important features of Knox is the warranty void fuse (eFuse). This is a one-time programmable hardware component that permanently records whether the device has been tampered with:
- Knox Warranty Void: 0x0 — The device has never been modified. Warranty is intact
- Knox Warranty Void: 0x1 — The device has been rooted or modified. Warranty is permanently voided
Once the eFuse is tripped (set to 0x1), it cannot be reset by any means—software or hardware. This is a permanent, irreversible change.
For more on Samsung security, see our Samsung blacklist check guide and Android IMEI check guide.
What Trips the Knox Fuse?
The following actions will trip the Knox fuse and permanently void your warranty:
- Rooting: Gaining root/administrator access to the Android system
- Custom firmware: Installing custom ROMs, kernels, or recovery images
- Bootloader unlocking: Unlocking the bootloader (on supported models)
- Flashing unauthorized software: Using Odin to flash non-official firmware
- Downgrading firmware: Installing an older version of the OS
- Modifying system partitions: Any tampering with system-level files
Once any of these actions is performed, the Knox eFuse is permanently tripped, and the following features are disabled:
- Samsung Pay
- Secure Folder
- Samsung Pass
- Enterprise Knox features (MDM, Knox Configure)
- Warranty service at Samsung service centers
How to Check Samsung Knox Warranty Status
Method 1: Phone INFO App (Recommended)
The most reliable way to check Knox warranty status on the device:
- Download Phone INFO or Samsung Phone INFO from Google Play Store
- Open the app and grant necessary permissions
- Look for Knox Warranty Void status
- If it shows 0x0, Knox is intact and warranty is valid
- If it shows 0x1, Knox has been tripped and warranty is voided
Method 2: Samsung Members App
- Open the Samsung Members app (pre-installed on Samsung phones)
- Go to Support
- Check device status and diagnostics
- Look for any warranty or security status warnings
Method 3: Service Mode (Some Models)
On some Samsung models, you can access service mode:
- Open the Phone app and dial
*#0*# - This opens the service menu (if supported)
- Look for device status or warranty information
Note: This code may not work on all models or carrier-locked devices.
Method 4: IMEICheck (Remote Check)
Use IMEICheck to check Samsung warranty status remotely:
- Get the IMEI (dial
*#06#) - Enter it on IMEICheck
- Review the Samsung warranty section of the report
Note: IMEICheck shows manufacturer warranty status. For Knox-specific tripped status, use the Phone INFO app on the device itself.
Method 5: Samsung Service Center
Take the phone to a Samsung authorized service center. They can check the Knox status and warranty using their internal diagnostic tools.
Samsung Warranty Coverage
| Component | Warranty Period |
|---|---|
| Phone (main device) | 12-24 months (varies by region) |
| Battery | 12 months |
| Charger | 12 months |
| Earphones | 6 months |
| Screen (manufacturing defect) | 12-24 months |
For warranty comparisons, see our Huawei warranty and Google Pixel warranty guides.
Why Knox Warranty Matters When Buying Used
When buying a used Samsung phone, Knox warranty status is one of the most important checks:
- Warranty validity: A tripped Knox means no warranty service—ever. Samsung will refuse repairs even for manufacturing defects
- Samsung Pay: A tripped Knox disables Samsung Pay permanently, which is a key feature for many users
- Security concerns: A tripped Knox indicates the phone was rooted or modified, which may introduce security vulnerabilities
- Resale value: Samsung phones with tripped Knox have significantly lower resale value
- Software stability: Rooted phones may have stability issues, custom ROMs, or malware
- Banking apps: Many banking and financial apps refuse to run on devices with tripped Knox
Buying a Used Samsung: Knox Checklist
- Check the IMEI: Dial
*#06#and run a check on IMEICheck - Check Knox warranty: Use Phone INFO app to verify Knox is not tripped (0x0)
- Check Samsung Pay: Try opening Samsung Pay—if it fails, Knox may be tripped
- Check Secure Folder: Try creating a Secure Folder—if it fails, Knox is tripped
- Check blacklist: Run a Samsung blacklist check
- Check carrier lock: Verify the phone is unlocked
- Check for root: Look for SuperSU, Magisk, or other root management apps
- Test all features: Camera, fingerprint, Samsung Pay, Bluetooth, WiFi
For more buying tips, see our IMEI check before buying guide and phone originality guide.
FAQ
What is Samsung Knox warranty void?
Samsung Knox warranty void is a status flag that indicates whether the Knox security hardware has been tripped. When you root a Samsung phone, install custom firmware, or make unauthorized modifications, the Knox fuse is permanently tripped (set to 0x1). This voids the warranty and disables Samsung Pay, Secure Folder, and other Knox features. The tripped status cannot be reset.
How do I check my Samsung Knox warranty status?
To check Samsung Knox warranty status: 1) Download and run Phone INFO app from Google Play, 2) Look for Knox Warranty Void status, 3) Or dial *#0*# for service mode (works on some models), 4) Or check in Settings > Biometrics and security > Knox. You can also use IMEICheck to check Samsung warranty status by IMEI.
Can Samsung Knox be reset?
No, Samsung Knox cannot be reset once tripped. The Knox warranty void flag is stored in a hardware fuse (eFuse) that is permanently burned when triggered. There is no software or hardware method to reset it. The only way to get a non-tripped Knox is to use a Samsung phone that has never been rooted or modified.
Does rooting Samsung void warranty?
Yes, rooting a Samsung phone voids the warranty permanently. When you root the device, the Knox fuse is tripped, which is detectable by Samsung service centers. Even if you unroot the phone later, the Knox tripped status remains. Samsung will refuse warranty service for any device with a tripped Knox.
Conclusion
Samsung Knox warranty status is a unique and critical check when buying a used Samsung phone. Unlike other brands where modifications can be hidden, Samsung's Knox eFuse provides a permanent, tamper-proof record of whether the device has been modified. Always check Knox status before buying a used Samsung—a tripped Knox means no warranty, no Samsung Pay, and no Secure Folder, significantly reducing the phone's value and functionality.
Check your Samsung warranty status at IMEICheck—enter your IMEI for comprehensive results.