https://devzone.nordicsemi.com/f/nordic-q-a/20215/nrfutil-settings-generate-for-nrf52-qfabHello, it seems the current nrfutils release assumes that the bootloader settings will be stored at address 0x7F000 on an nRF52. However, unless I&#39;m mistaken, that is only true for QFAA versions of the chip, since QFAB versions have only 256KB ofen-USTelligent Community 13Wed, 08 Mar 2017 10:42:27 GMThttps://devzone.nordicsemi.com/thread/78769?ContentTypeID=1Wed, 08 Mar 2017 10:42:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:27294ed4-f004-4534-a154-119203c32978Matteo<p>Thank you Bjørn, that makes sense.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/78768?ContentTypeID=1Wed, 08 Mar 2017 10:16:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d483687e-3d8e-42a1-9a90-32e30535906ebjorn-spockeli<p>Hi Matteo,</p> <p>you are correct in that nrfutil generates a settings page starting at the address 0x7F000 if the NRF52 is given as the --family option. As you have pointed out this settings hex file cannot be used on a nRF52 QFAB variant due to its 256kB flash.</p> <p>So yes, you will have to modify the source of nrfutil to set 0x3F000 as the start address of the settings page. You have to modify <code>bl_dfu_sett.py</code>, found in <code>nordicsemi\dfu</code>, specifically change</p> <pre><code>bl_sett_52_addr= 0x0007F000 </code></pre> <p>to</p> <pre><code>bl_sett_52_addr= 0x0003F000 </code></pre> <p>under <code>class BLDFUSettings(object):</code> at line 72. I will report this internally so that an option for the 256kB flash variant is added.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>