https://devzone.nordicsemi.com/f/nordic-q-a/84605/jlink-exe-remove-approtectMy employer will be building a custom product in the next two weeks containing the NRF52840 module. We are using JLink debuggers in our test fixture to achieve this. We are using the JLink debugger&#39;s output target power feature to control power deliveryen-USTelligent Community 13Thu, 10 Feb 2022 02:01:46 GMThttps://devzone.nordicsemi.com/thread/352201?ContentTypeID=1Thu, 10 Feb 2022 02:01:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bb32f989-f868-40c7-8c3f-342972887365dbieber-rfideas<p>Update: I discovered that an older version of JLink was installed (from 2017) and was being used instead. Apparently the support for disabling protection came only a month after this version of JLink and this version did not support removing protection. The latest version of JLink does this automatically after attempting to connect to the chip.</p> <p>I am able to lock the device using these JLink commands:</p> <p>w1 0x10001208 0</p> <p>reset</p> <p>And unlocking is as simple as issuing a connect command.</p><div style="clear:both;"></div>