https://devzone.nordicsemi.com/f/nordic-q-a/119628/how-to-set-cis-phy-to-1m-in-le-audioIn nrf5340 audio application( SDK2.9.0), I try to set phy to 1M in CIS( 1 gateway,2 headsets). I made these changes： Add in prj.conf: In C:\ncs\v2.9.0\zephyr\include\zephyr\bluetooth\audio\audio.h , set to 1M: In C:\ncs\new_CIS\src\bluetoothen-USTelligent Community 13Mon, 10 Mar 2025 15:51:42 GMThttps://devzone.nordicsemi.com/thread/526612?ContentTypeID=1Mon, 10 Mar 2025 15:51:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6d4e59d4-32cd-49a9-8527-602233ec3cbdMaria Gilje<p>Hello, </p> [quote user=""]After changing these, the CIS still use 2M.[/quote] <p>Can you also share where you see this? </p> <p>Your Kconfig symbols and your source code edits seems like enough to enforce 1M PHY. </p> <p>Best regards,</p> <p>Maria</p><div style="clear:both;"></div>