Handshaking... Error Unexpected Response 0x68 __top__

Inside Elias’s retinal display, the world turned a jagged, neon red. A single line of code scrolled across his vision, repeating like a heartbeat: CRITICAL FAILURE: ERROR UNEXPECTED RESPONSE 0X68

The serial monitor crackles to life.

: Many modern devices have a "Secure Boot" enabled. If you try to flash or read the device without a specific "DA" (Download Agent) file or an authentication file ( .auth ), the device rejects the connection with this error. handshaking... error unexpected response 0x68