https://devzone.nordicsemi.com/f/nordic-q-a/32054/usb-driver-issue-when-used-with-le-secure-pairingHi, I am using SDK 14.2 with nrf52840 board. In my project I am using USB and BLE together. I have noticed that when I enable the LE Secure pairing and after that my USB driver stopped giving me APP_USBD_CDC_ACM_USER_EVT_RX_DONE even though I am sendingen-USTelligent Community 13Wed, 14 Mar 2018 14:01:29 GMThttps://devzone.nordicsemi.com/thread/124390?ContentTypeID=1Wed, 14 Mar 2018 14:01:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a0d4371d-3d15-4ea6-b45e-c6dcb3e2765dFormerMember<p>Within a coulpe of weeks, a new version of the SDK that fixes quite a few bugs will be released. I would recommend you to wait for that release, and then try again.</p> <p>Also, which version of the nRF52840 do you have? Make sure to have the latest version.</p><div style="clear:both;"></div>