https://devzone.nordicsemi.com/f/nordic-q-a/35068/change-ieee-mac-address-of-nrf52832-industrializationHello , we are in the production phase, I use us addess mac(If I bought unique MAC address from IEEE. ) so our factory asks for the registry that will be configured, so is it possible to modify the register FICR or is it UICR?en-USTelligent Community 13Tue, 05 Jun 2018 09:08:29 GMThttps://devzone.nordicsemi.com/thread/134686?ContentTypeID=1Tue, 05 Jun 2018 09:08:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:22aed573-b594-4d3c-989a-3af675b4b35fFormerMember<p>The <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fnvmc.html&amp;cp=2_1_0_10&amp;anchor=concept_pcl_wbz_vr">NVMC </a>chapter in the product specification describes erase of UICR, I would recommend you to read it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/134682?ContentTypeID=1Tue, 05 Jun 2018 08:43:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15601ef2-7639-4d1d-81cc-62fad35910d2Nero<p>Thanks you ,its possible to do a write lock in the UICR ,to protect it (in erase )</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/134678?ContentTypeID=1Tue, 05 Jun 2018 08:21:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a8c0ebe-bea0-42d1-8da9-41710cd4cd96FormerMember<p>Yes, you should store the addresses in UICR, and read the address from there every time the chip power-up/re-boot. The purpose of <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fuicr.html&amp;cp=2_1_0_13&amp;anchor=concept_rnp_grp_xr">UICR </a>is to store user specific settings.</p> <p>&nbsp;</p> <p>FICR is programmed in the production of the chip itself, and cannot be used to store custom addresses.</p><div style="clear:both;"></div>