https://devzone.nordicsemi.com/f/nordic-q-a/27075/sdk11-bootloaderhi everyone.I have a question about the bootloader SDK11.0 ,I download the bootloader engineering modified to nrf51822 board, the nrf51822 can be advertising, but when I upgrade using nrf toolbox prompt upgrade failure?Why is this?Let me put my projecten-USTelligent Community 13Tue, 28 Mar 2017 01:12:56 GMThttps://devzone.nordicsemi.com/thread/106438?ContentTypeID=1Tue, 28 Mar 2017 01:12:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1594bc99-6122-4153-af73-4d61127bb97fsummer<p>ok,thank you very much.I have find the problem and has solved the problem.I was mistaken about the address of the package that upgrade is not successful.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/106437?ContentTypeID=1Mon, 27 Mar 2017 11:26:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ff4d497-50dd-4d2a-9e82-527367da770bHung Bui<p>@summer: You need to provide some more information on:</p> <ul> <li> <p>The log you have when you update with Toolbox, try to find it using the nRFLogger app.</p> </li> <li> <p>Which guide did you follow ?</p> </li> <li> <p>Which application firmware did you use , how did you generate the .zip DFU package.</p> </li> <li> <p>Have you tried the example .zip provided with the nRFToolbox app (inside NordicSemiconductor folder) ?</p> </li> </ul><div style="clear:both;"></div>