The tool's free exploit often only supports older models (up to Galaxy S22) or security patches prior to late 2022. Newer devices like the S24 Ultra may simply not be compatible with the current version's "one-click" method.

For many Samsung users, changing the CSC requires the device to be in a specific mode. Open the dialer and enter *#0808# . Select . Click OK or Save and retry the operation in SamFw Tool. 2. Update to the Latest Version

If the exploit consistently fails, experts on Reddit suggest a more manual approach:

The exploit relies on specific diagnostic modes. If the phone is not set to the correct USB settings (like DM+ADB+RNDIS ), the connection will fail.