https://devzone.nordicsemi.com/f/nordic-q-a/125877/marking-code-fw-versionDear Company We are using the following component NORDIC NRF52840-CKAA-F-R7 and we have a problem in the test phase. We have two version with the following marking code on the component: N52840CKAA F0 2434 LL and N52840CKAA F1 2516 LL --&gt;The Pen-USTelligent Community 13Fri, 28 Nov 2025 11:41:42 GMThttps://devzone.nordicsemi.com/thread/555730?ContentTypeID=1Fri, 28 Nov 2025 11:41:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d533fd4d-fbad-4a59-addb-1e37798aca2cH&#229;kon Alseth<p>Dear Enzo Ciampi,</p> <p>&nbsp;</p> [quote user=""]<p>N52840CKAA<span style="background-color:rgba(153, 204, 0, 1);">F0<span style="background-color:rgba(255, 255, 255, 1);">2434</span></span>LL and&nbsp;<span>N52840CKAA</span><span style="background-color:rgba(153, 204, 0, 1);"><span style="background-color:rgba(255, 0, 0, 1);">F1</span><span style="background-color:rgba(255, 255, 255, 1);">2516</span></span><span>LL</span></p> <p><span>--&gt;The P/N with marking F0 works, but the one with marking F1 does not work.</span></p> <p><span>Question:&nbsp;</span></p> <p>What is the difference between the two ICs with different marking codes?</p> <p></p>[/quote] <p>The two devices are equal, just from a different production site:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1764329785825v1.png" alt=" " /></p> [quote user=""]If the component with marking F1 is reprogrammed by us, will all data be deleted?[/quote] <p>The devices are delivered empty from our side, and it is assumed that you program the device in production.</p> <p>&nbsp;</p> <p>Do all devices from this lot have the same problem? If so, what is the current failure rate?</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>