https://devzone.nordicsemi.com/f/nordic-q-a/100864/nrf52840-access-protection-code-qaff-fHi, What&#39;s the difference between flashing nRF52840 QAFF and nRF52840 QAFF-F devices? My understanding from the specs is that nRF52840 QAFF-F has access port protection enabled by default and requires sending an ERASEALL command before flashing. Isen-USTelligent Community 13Fri, 16 Jun 2023 08:01:39 GMThttps://devzone.nordicsemi.com/thread/431424?ContentTypeID=1Fri, 16 Jun 2023 08:01:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c11d1c26-ba39-495d-a2c4-2c15180c7d20Kazi Afroza Sultana<p>Hello,</p> <p>I think you meant QFAA and QFAA-F devices. Yes, by default access port protection is enabled in the latest version (Fxx and later).</p> <p>Thanks.</p> <p>BR</p> <p>Kazi</p><div style="clear:both;"></div>