https://devzone.nordicsemi.com/f/nordic-q-a/25884/how-to-change-mac-in-nrf52SDK13. S132. I try to change mac by: void set_addr (void) { static ble_gap_addr_t m_central_addr; m_central_addr.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC; m_central_addr.addr[0] = 0xfd; m_central_addr.addr[1] = 0x71; m_central_addren-USTelligent Community 13Thu, 12 Oct 2017 12:52:28 GMThttps://devzone.nordicsemi.com/thread/101943?ContentTypeID=1Thu, 12 Oct 2017 12:52:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd2f73b4-a20b-416a-a9ed-5fc3f11f5ea4Sigurd<p><code>m_central_addr.addr[5] = 0xfd</code> is allowed.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101942?ContentTypeID=1Thu, 12 Oct 2017 12:50:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7eca2809-0dd4-4f06-b7b7-67ee8fa75c29Sigurd<p>For a Random static address(<code>BLE_GAP_ADDR_TYPE_RANDOM_STATIC</code>) 0x46 is not allowed. See the figure in <a href="https://devzone.nordicsemi.com/question/110308/i-want-to-change-the-ble-address/?answer=110344#post-id-110344">this post</a>.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101941?ContentTypeID=1Thu, 12 Oct 2017 12:47:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a0f6cb64-0e69-409f-a26e-baa327ef4a6dMikhail<p>Yes! Work. Thanks. But If last byte I need 0x46? How to do it?</p> <p>Decided. I write from back. I mean that now m_central_addr.addr[5] = 0xfd.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101940?ContentTypeID=1Thu, 12 Oct 2017 12:41:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2aa0d0be-2a8d-4098-b340-c19a55b7fbccSigurd<p>Hi,</p> <p>As stated in your code snippet, the <em>2MSB must be set 11</em>. You are using <code>0x46</code>, that is in binary <code>01000110</code>, i.e. the 2MSB is 01. Try to set it to 0xC6 instead.</p> <pre><code>m_central_addr.addr[5] = 0xC6; // 2MSB must be set 11 </code></pre> <p>Call your function <code>set_addr()</code>, after <code>ble_stack_init()</code></p><div style="clear:both;"></div>