https://devzone.nordicsemi.com/f/nordic-q-a/1694/re-program-mac-idHi guys, Is there any way that I can re program the MAC ID of the nRF51822 devices through the SWD interface? I was able to do this using the UART interface with the BL600 (Laird) module which is based on the nRF51822 SOC so I am thinking there has toen-USTelligent Community 13Tue, 04 Mar 2014 11:36:05 GMThttps://devzone.nordicsemi.com/thread/7488?ContentTypeID=1Tue, 04 Mar 2014 11:36:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4013bf31-96fd-4378-b0a9-5b54b5ab58abOle Morten<p>You can&#39;t change the address in FICR, but what you can do is to write a custom address somewhere else in flash, then read it out in your program and tell the stack to use it by calling <a href="https://devzone.nordicsemi.com/documentation/nrf51/5.1.0/html/a00828.html#ga073bbb0a6e68fe0a0ef8bb59d829c986">sd_ble_gap_address_set()</a>.</p> <p>This is the kind of data that is well suited to be written in the customer part of UICR, since it should never need to change while running. Take a look at chapter 7 of the nRF51 Reference Manual for which addresses can be used. You can write to UICR either with nrfjprog or as part of your application. Take a look at uicr_config_example for the latter.</p><div style="clear:both;"></div>