https://devzone.nordicsemi.com/f/nordic-q-a/46738/nrf52832-dfu-app-sd-blHello! I used nrf52832(SDK12.3,softdevice:v3.0) in my project, now i want to upgrade softdevice to v6.1.1 by DFU. I used the same private.key to generate zip package（App+SD+BL）, with this package i can enter bootloader, but cannot continue to upgradeen-USTelligent Community 13Tue, 30 Apr 2019 02:39:32 GMThttps://devzone.nordicsemi.com/thread/184415?ContentTypeID=1Tue, 30 Apr 2019 02:39:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f65a1920-2d29-48c1-aba7-c565c60b7469Sunshine8166<p><span>Thank you for your reply, I have successfully upgraded to SDK15.3 with&nbsp;softdevice&nbsp;V6.1.1, this&nbsp;problem is really caused by&nbsp;--sq-req.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/184297?ContentTypeID=1Mon, 29 Apr 2019 12:07:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0ccebab1-7f6a-4f7e-bbe9-dc93b31b863dEinar Thorsrud<p>Hi,</p> <p>Generally there is no problem upgrading to a newer SoftDevice, bootloader and application.&nbsp;The only thing you need to think you need to think of is that --sq-req when you generate the DUF zip package must include both the SoftDevice ID of the old and new SoftDevice.</p><div style="clear:both;"></div>