Samsung Re-Locked After Update? Fix for S25, S24, Fold 6 & Flip 6 (Working 2026 Method)
If your Samsung phone became network locked after a recent update, especially on models like S25, S24, Fold 6 or Flip 6, the issue is usually caused by changes in modem (CP) firmware after OTA updates. A working fix involves flashing an older modem version with the same BIT level and preventing future updates that may trigger the relock again.
This issue has been widely reported after the January 2026 Samsung updates, especially on U.S. carrier devices that were previously working normally.
What Happens When Samsung Gets Re-Locked?
- Network Locked or Phone Locked message
- Phone asks for MCK unlock code
- SIM card no longer works
This can happen even if the phone was fully working before the update.
Why Samsung Phones Re-Lock After Updates
Samsung updates the modem (CP) firmware separately from the main system. When this changes:
- Previous unlock state may no longer apply
- Carrier restrictions may be re-applied
- Device may behave as locked again
This is especially common on newer U.S. Samsung models.
Supported Models
- S25 Series: SM-S938U, SM-S937U, SM-S936U, SM-S931U
- S24 Series: SM-S928U, SM-S926U, SM-S921U
- Fold 6: SM-F956U
- Flip 6: SM-F741U
Working Fix: Flash Older Modem (CP)
The most effective fix is to flash an older CP (modem) firmware with the same BIT version.
- Do NOT downgrade BIT version
- Use correct firmware for your exact model
- Flash only CP file (not full firmware)
This restores the previous modem behavior and allows the phone to accept SIM cards again.
Important Limitation
- OTA updates may stop working
- Future updates may relock the phone again
Disable Updates (ADB Method)
adb shell cmd package disable-user user 0 com.wssyncmldm adb shell cmd package uninstall user 0 com.sec.android.soagent
Requirements:
- USB debugging enabled
- Samsung USB drivers installed
- ADB tools installed
Important: Different Fix for S25 vs S24
Samsung S25 models use a newer firmware structure and may require a different approach when flashing fails.
???? If you are working on S25 models or get errors like super.img fail, follow this guide:
Samsung S25 Odin Flash Fail Fix (super.img)
???? If you are working on S24, S23, S22 or older models, use the standard Odin method here:
Samsung Flash Guide (No Data Loss – Odin Method)
Common Mistakes to Avoid
- Using wrong firmware
- Wrong BIT version
- Updating again after fix
- Trying random methods without understanding cause
What If the Fix Stops Working?
If Samsung releases a new firmware with higher BIT version, this fix may no longer work.
In that case:
- The phone may need to be unlocked again
- Alternative servicing methods may be required
If you want a faster solution, you can contact us or place an order directly.
Need Help with Samsung Unlock or GSM Tools?
At UnlockResellers.com, we work with GSM technicians worldwide and provide tested solutions for real device issues.
???? Visit UnlockResellers.com
FAQ
Why did my Samsung re-lock after update?
Because modem firmware changed and reset the unlock state.
Will this fix work permanently?
It works until another update changes the modem again.
Can I update after fixing?
Not recommended, as it may relock the device.
Does this apply to all Samsung models?
Mainly newer Samsung devices, especially U.S. variants.