Nrfutil "failed to open" error for DFU over BLE

RE: Nrfutil "failed to open" error for DFU over BLE

Oisin Johnston — Fri, 19 Jan 2018 14:16:11 GMT

That worked for me! I'm not sure why now, but it's a start! Thanks so much for the help!

RE: Nrfutil "failed to open" error for DFU over BLE

Bjørn Kvaale — Fri, 19 Jan 2018 13:00:42 GMT

Have you tried to update the application using secure dfu with an easier example first? If you have the nrf52832DK, I can recommend updating the Blinky application first (examples\peripheral\blinky\pca10028\s130). Once the DFU has completed, the LED's 1-4 on the DK should start blinking one after the other. The Buttonless DFU example is essentially the same as described in the Secure DFU blog post, with the exception that after the DFU, the nrf52 should advertise as Nordic_Buttonless. Then, you should be able to connect to the DK via nrf connect on pc or smartphone, write 0x01 to it & notice that the LED's on the DK switch. This signifies that the DK has entered bootloader mode again (see this link to test the buttonless dfu example).

RE: Nrfutil "failed to open" error for DFU over BLE

Oisin Johnston — Thu, 18 Jan 2018 10:57:19 GMT

I followed all the steps on that blog post and still get the same error.

RE: Nrfutil "failed to open" error for DFU over BLE

Bjørn Kvaale — Wed, 17 Jan 2018 14:48:01 GMT

Have you taken a look at this secure dfu blog post? There's a section called buttonless DFU.