Sometimes the chip enters a state where the debug interface is frozen. A standard "Unlock" command isn't enough; the chip needs a full power cycle or a reset under specific conditions.
If you see RDP Level 2 (permanent lock), no unlock tool will work . Level 2 fuses a physical bit inside the chip. The only fix is a . Treat Level 2 as a one-way door. writing flash programmer... fail unlock tool
Hold the boot keys (Vol+ and Vol-) and connect the cable before plugging the battery back in. This can sometimes force the device into the correct BROM mode for the programmer to write successfully. Summary for UnlockTool Users Sometimes the chip enters a state where the
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