https://devzone.nordicsemi.com/f/nordic-q-a/45153/ota-dfu-s110-to-s130-with-uicr-clenr0-setHi, Please help, I&#39;ve been struggling with this problem for a week and I want to get to the bottom of it. I have production devices in the field based on s110 v7.1.0. The newer firmware uses s130 2.0 and both work independently on the same hardwareen-USTelligent Community 13Thu, 21 Mar 2019 14:48:07 GMThttps://devzone.nordicsemi.com/thread/177636?ContentTypeID=1Thu, 21 Mar 2019 14:48:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7462328d-6edc-4aba-ac0d-0396fabc8641Hung Bui<p>Hi Karim,&nbsp;</p> <p>As it mentioned in the documentation, and discussed partly <a href="https://devzone.nordicsemi.com/f/nordic-q-a/13145/s130-v2-soft-device-size-in-future-and-protection">here</a>, it&#39;s not possible to update to a softdevice bigger size than the size indicated by CLENR0. The reason is that the part of the softdevice the exceed the CLENR0 won&#39;t be able to access the memory located under CLENR0 address. It&#39;s the hardware protection (please refer to the spec) and you can&#39;t &quot;hack&quot; the MBR to avoid that.&nbsp;</p> <p>The only workaround is to erase the chip and not write to CLENR0, but then it&#39;s not OTA DFU, unfortunately.&nbsp;</p><div style="clear:both;"></div>