https://devzone.nordicsemi.com/f/nordic-q-a/64814/secure-bootloaderI got a device with a secure bootloader, but I lost the private key and the firmware got corrupted somehow. Is it possible to flash a new bootloader via BLE or is it bricked forever?en-USTelligent Community 13Fri, 14 Aug 2020 08:29:54 GMThttps://devzone.nordicsemi.com/thread/264570?ContentTypeID=1Fri, 14 Aug 2020 08:29:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:103e0299-5c2b-4f4b-ac59-3472fbeb5ccftesc<p>Hi,</p> <p>You can only use correctly signed update images with the secure DFU bootloader. This is the &quot;secure&quot; part of it. If there was a way to do updates without signing them using the private key, this would be a serious security flaw.</p> <p>So, unless you have the private key (or an image already signed with the private key) you cannot do a secure DFU, no.</p> <p>Only option then would be to connect to the device through the programmer interface, i.e. use a J-Link programmer the same way the device was programmed during development and/or production.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/264544?ContentTypeID=1Fri, 14 Aug 2020 04:25:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:da25ae25-0740-46a9-9db8-c4feec01bb81Nguyen Hoan Hoang<p>you can re-flash it using a JTAG only</p><div style="clear:both;"></div>