Secure Boot and Debug Lock#

At the end of production, a critically important step is to lock the JTAG ports of both cores. Silicon Labs recommends that this step is completed at the end of production to prevent access or modification to the public keys and OTA keys that may be stored on the device. If any of these keys are modified after initial provisioning, secure boot will fail. For instructions on locking the debug port, refer to AN1428 : SIWX917 Debug Lock.