https://devzone.nordicsemi.com/f/nordic-q-a/4961/nrf51822-beacon-v1-1-0-and-nrf-toolbox-dfu-crc-errorHi, I&#39;ve followed the steps mentioned in this thread devzone.nordicsemi.com/.../ and everything seemed to work fine. I&#39;ve successfully uploaded &quot;nrf51822_beacon_app.hex&quot; file copied from C:\Nordic Semiconductor\nRF51822 Beacon v1.1.0\Precompiled hexen-USTelligent Community 13Tue, 30 Dec 2014 20:26:09 GMThttps://devzone.nordicsemi.com/thread/17478?ContentTypeID=1Tue, 30 Dec 2014 20:26:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e02f4e18-ecc1-42d8-b37e-5dc0a6665e0fAdam<p>Could you please advise how to generate a new init file for a given project in Keil?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17477?ContentTypeID=1Tue, 30 Dec 2014 17:00:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c8dffea-6c08-4411-b8ed-35d2174ec9b5Vidar Berg<p>Hi, the .hex is parsed to a binary file in the Anroid app where the .dat file contains a 16-bit CRC of the parsed binary. This is used by the peripheral to check the integrity of the of the received file. Thus, with a recompiled project the CRC value may not match. So you have to generate a new init file with a CRC value that corresponds to the new file. Details about the init file is documented here: <a href="http://developer.nordicsemi.com/nRF51_SDK/doc/7.1.0/s110/html/a00065.html">developer.nordicsemi.com/.../a00065.html</a></p> <p>This answer by Stefan may also be useful: <a href="https://devzone.nordicsemi.com/question/22586/anyone-do-successfully-dfu-ota-for-sdk701-softdevice-s110-v710/">devzone.nordicsemi.com/.../</a></p> <p>Edit 12.31: Fixed link Stefan&#39;s answer. Please see &quot;update 16.12.2014&quot; in his answer for one way of generating the init file.</p><div style="clear:both;"></div>