https://devzone.nordicsemi.com/f/nordic-q-a/4918/need-override-in-nrf-radio-modeThe nRF51 Series Reference Manual v3.0 notes the potential need to set the OVERRIDEx registers in the radio mode to values from FICR.BLE_1MBIT to meet deviation requirements for BLE (per PCN-083 rev 1.1). FICR also contains override settings for NRF_1MBITen-USTelligent Community 13Fri, 02 Jan 2015 21:25:18 GMThttps://devzone.nordicsemi.com/thread/17368?ContentTypeID=1Fri, 02 Jan 2015 21:25:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a4053d89-a5a7-4c9b-8e75-a21288f8d98eAsbj&#248;rn<p>No, the trimming values for the radio in the OVERRIDE register in FICR will only affect the 1 Mbit BLE mode. So you can switch between the various radio modes with the OVERRIDE in use. <a href="https://www.nordicsemi.com/eng/nordic/download_resource/22476/1/14456572">Please also have a look at the Product Anomaly Note regarding the OVERRIDE register in FICR.</a></p><div style="clear:both;"></div>