https://devzone.nordicsemi.com/f/nordic-q-a/18251/sd130-sdk12-1-0-ble-bootloader-problemHello, I have some problem in DFU. I ask this again. I did as below. Key generation nrfutil keys generate c:\vault\priv.pem public key generation in code format nrfutil keys display --key pk --format hex c:\vault\priv.pem nrfutilen-USTelligent Community 13Thu, 08 Dec 2016 10:32:48 GMThttps://devzone.nordicsemi.com/thread/70495?ContentTypeID=1Thu, 08 Dec 2016 10:32:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f2ce70b1-3da0-49ce-b829-43d68346c36abjorn-spockeli<p>Hi Air, which error message to you get in the Android app when the DFU fails? In step 3 you have to set the --hw-version to 51 and not 1.</p><div style="clear:both;"></div>