Secure FW updates via BLE or USBhttps://devzone.nordicsemi.com/f/nordic-q-a/126678/secure-fw-updates-via-ble-or-usbI am currently developing a HID device that supports BLE and USB. I have tested the firmware update function via both BLE and USB (USB CDC ACM). However, I am experiencing the following issues: BLE connection The firmware update service is availableen-USTelligent Community 13Fri, 23 Jan 2026 06:54:08 GMTRE: Secure FW updates via BLE or USBhttps://devzone.nordicsemi.com/thread/559431?ContentTypeID=1Fri, 23 Jan 2026 06:54:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f4755470-14da-4457-b127-388d17cbd84fTurbo J<p>The lib requires a COM port to work over USB. And while you could move that USB support into MCUBOOT itself, it increases the bootloader size in flash by a lot. Not really recommended on the NRF52840.</p> <p>BLE needs to be in disconnected (advertising) state for bleak python BTLE lib to be able to connect. This limitation might be windows only - BTLE APIs&nbsp; in Windows are dog ***. The smpmgr stuff uses bleak internally.</p> <p>It should establish BTLE secure connection as long as there is bonding information in windows OS available.</p><div style="clear:both;"></div>