https://devzone.nordicsemi.com/f/nordic-q-a/43993/dfu-ble-speedHi, I use nRF5_SDK_15.2.0_9412b96\examples\dfu\secure_bootloader\pca10040_ble bootloader. I upload my app to my board using PCA10031 and nRF Connect v2.6.2 on Win10 and I can achieve max. 1.3 kB/s speed. Is that maximum achievable or can it be improveden-USTelligent Community 13Fri, 22 Feb 2019 07:08:39 GMThttps://devzone.nordicsemi.com/thread/172427?ContentTypeID=1Fri, 22 Feb 2019 07:08:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fe14f3a4-247c-4e1f-bc4f-f3da74269b02Simonr<p>Hi Martin</p> <p>As stated in the post&nbsp;Mike linked to, there are no hidden tricks for making the DFU go a lot faster. You can try decreasing the connection interval to make it faster, as well as NRF_FSTORAGE_SD_MAAX_WRITE_SIZE.&nbsp;</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/172401?ContentTypeID=1Fri, 22 Feb 2019 01:45:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:00af3857-3092-45ab-b886-afe55c3d76b6twihtronics<p>this information might help&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/29858/transfer-speed-secure-dfu-sdk14">devzone.nordicsemi.com/.../transfer-speed-secure-dfu-sdk14</a></p><div style="clear:both;"></div>