https://devzone.nordicsemi.com/f/nordic-q-a/34523/it-is-possible-to-use-thingy-52-firmware-on-nrf52832-custom-boardi made custom board refer to thingy 52 Circuit all fuction circuit is same so i want to use thingy 52 firmware when i was erase all memory nrf52832 and upload thingy_v2.1.0.HW_1.0 file by use nrf52840-dk and nrfgo studio after upload fileen-USTelligent Community 13Wed, 23 May 2018 11:48:29 GMThttps://devzone.nordicsemi.com/thread/132972?ContentTypeID=1Wed, 23 May 2018 11:48:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b2e29bbb-899f-4e69-aeb5-accb87092749tesc<p>Hi,</p> <p>If you want do do your own updates (with your own custom OTA DFU packets) then you must build the bootloader yourself. You need to make yourself your own key pair, and build the bootloader with the public key of that key pair. Then you use the private key (which you should keep for yourself) to sign the DFU packet.</p> <p>See our blogpost, <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">Getting started with Nordic&#39;s Secure DFU bootloader, a step by step guide</a>, for an introduction to how to do DFU. The Thingy firmware is built on nRF5 SDK v12.1.0 and you find all firmware projects on the <a href="https://www.nordicsemi.com/eng/Products/Nordic-Thingy-52#Downloads">Nordic Thingy:52 downloads page</a>.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>