If the previous owner enabled "Reactivation Lock" in their Samsung account settings, the phone rejects any unauthorized ADB commands. The tool tries to run the exploit, but the phone’s Knox security blocks it, returning a "Fail."
The error message "Running exploit... Fail" in SamFW (a popular Samsung firmware flashing and FRP removal tool) is a common hurdle for users attempting to bypass security locks or modify device software. While it may seem like a finality, it is usually a symptom of specific environmental or security mismatches. The Anatomy of the Failure samfw running exploit fail
The exploit technically worked (e.g., a buffer overflow occurred), but the subsequent privilege escalation was blocked by MAC (Mandatory Access Controls). SAMFW’s validation check fails because it cannot read back the expected root token. If the previous owner enabled "Reactivation Lock" in
Ensure USB Debugging is enabled in Developer Options. Additionally, the USB connection mode on your phone should be set to MTP (Media Transfer Protocol). While it may seem like a finality, it
: Eject your SIM tray before starting the CSC change process, as active carrier signals can sometimes block the exploit.
If you want, provide the device firmware version, exploit framework output, and recent dmesg logs and I’ll give targeted remediation steps.
