https://devzone.nordicsemi.com/f/nordic-q-a/128316/how-could-i-use-the-fem-with-nrf54lm20-dkHi I want to use the FEM 21540 with nRF54LM20. My overlay is : My config is: I think this should work because my nRF54L15 DK works well with this. But it is not working, could you give me some advice?en-USTelligent Community 13Tue, 02 Jun 2026 07:15:41 GMThttps://devzone.nordicsemi.com/thread/567245?ContentTypeID=1Tue, 02 Jun 2026 07:15:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b26bd3fb-34e8-4fef-a9d2-f5ac83379ab6Ziyao Zhou<p>I have checked the official application notes, notice that 54LM20 support FEM SPI mode.&nbsp;</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/pastedimage1780384458850v1.png" alt=" " /></p> <p>But I have no idea which pin should I use. So I try to add the argument:&nbsp;</p> <p>-DSHIELD=nrf21540ek</p> <p>But after buiding I cannot see any change in the DTS file indicating what pin should I use.&nbsp;</p> <p>Could you give me some advice?</p><div style="clear:both;"></div>