https://devzone.nordicsemi.com/f/nordic-q-a/78609/possible-ota-optionsHi, We bought smart watch from company xyz. Watch is running using Nrf52840 and supports buttonless DFU. we are customizing the smart watch firmware as per our requirements with xyz company support. Firmware is developed with support of dev kit anden-USTelligent Community 13Fri, 20 Aug 2021 05:27:46 GMThttps://devzone.nordicsemi.com/thread/325823?ContentTypeID=1Fri, 20 Aug 2021 05:27:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a20f4ad-72ac-4da7-a464-242ca2b416afSusheel Nuguru[quote user=""]<ul><li>Get private key from xyz company and create a OTA file(our application Hex + Key)</li> <li>Share our application hex to xyz company and let them create OTA files for us and share it.</li></ul>[/quote] <p>&nbsp;I think you got it covered.</p><div style="clear:both;"></div>