https://devzone.nordicsemi.com/f/nordic-q-a/126584/can-t-flash-an-nrf52840Hi, Just received a nRF52840 connected it to my Apple Silicon Macbook (maybe relevant?) which is running Sequoia 15.2 via a USB-C to micro cable. When I powered it up, the NeoPixel LED was shifting colors and all seemed fine. Then I tried to flashen-USTelligent Community 13Mon, 19 Jan 2026 16:08:10 GMThttps://devzone.nordicsemi.com/thread/559073?ContentTypeID=1Mon, 19 Jan 2026 16:08:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:72735d2b-8eb2-4139-bf83-b95637de23e7finebrand<p>Thanks Einar. I realized that was a better option after I posted here and copied my question there. It appears to be a defective board (or component thereon). The Adafruit people helped me out and&nbsp;are replacing it</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/559011?ContentTypeID=1Mon, 19 Jan 2026 12:38:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:73c3eeaf-3770-4262-8d1e-0a58abc2204cEinar Thorsrud<p>Hi,</p> <p>There may be someone on this forum that has experience with the Adafruit board and the UF2 bootloader. But if you do not hear from the community, I would advice asking in <a href="https://forums.adafruit.com/">Adafruit forums</a>&nbsp;as this is their board with their bootloader.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/558937?ContentTypeID=1Sun, 18 Jan 2026 07:49:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32c74665-10f8-47ae-8abe-994ce5853186finebrand<p>Should clarify that this is an Adafruit Feather Express. The only thing I&#39;ve done to it at this point is solder in the header pins.</p><div style="clear:both;"></div>