https://devzone.nordicsemi.com/f/nordic-q-a/22067/secure-dfu-on-sdk-11Hi, I am trying to secure DFU on SDK 11 (NRF52). Would you please suggest if there is a way to secure firmware on old sdk, without upgrading to sdk 12+? Thanks.en-USTelligent Community 13Tue, 16 May 2017 10:48:11 GMThttps://devzone.nordicsemi.com/thread/86664?ContentTypeID=1Tue, 16 May 2017 10:48:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:234b39ef-48a0-4cc8-99f1-867a2947ec51Hung Bui<p>I think you have 2 options:</p> <ol> <li> <p>Use the experimental bootloader_signing in SDK v10.</p> </li> <li> <p>Port the Secure DFU in SDK v12 back to SDK v11.</p> </li> </ol> <p>I would prefer to go for option #2.</p><div style="clear:both;"></div>