Possible Protection Is Enabled. Press Unprotect And Check Datasheet Jun 2026

This is the "Chip Kill" switch. If Level 2 is enabled, the debug interface is permanently severed.

The warning appears sometimes, but not always, when connecting. This is the "Chip Kill" switch

Sometimes you press the button, but the software returns an error: "Unprotect failed" or "Cannot disable protection." Sometimes you press the button, but the software

The message is not a suggestion—it is a safety interlock. It exists because the engineer who designed your microcontroller knew that disabling protection could have serious consequences, from erasing months of firmware development to bricking a field-deployed product. The tool doesn't know which specific protection fuse

When you encounter the error "possible protection is enabled" and you decide to press the "Unprotect" button, you are initiating a specific hardware sequence.

The tool doesn't know which specific protection fuse is blown. It just knows it can't access the memory.