https://devzone.nordicsemi.com/f/nordic-q-a/19706/ble-secure-dfu-bootloader-single-bank-operationI am currently using BLE Secure DFU Bootloader on my NRF51822 256kB but my program is now too large for dual bank operation. How can I setup the Secure DFU Bootloader to use a single bank? As shown by the bootloader printing out the below. 0&gt; :INFOen-USTelligent Community 13Wed, 15 Feb 2017 19:50:35 GMThttps://devzone.nordicsemi.com/thread/76672?ContentTypeID=1Wed, 15 Feb 2017 19:50:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:078b0268-f803-4cd8-ba42-becd578d1f1fjmp246<p>I&#39;m using SDK 12.2.0 and S130 2.0.1. Turns out my program was actually. 143812 bytes and I only had 107520 of free space. So I had a look at the map file to see what was using the flash. Now it works fine.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/76671?ContentTypeID=1Wed, 15 Feb 2017 11:37:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:66dbcf8b-6424-40bd-aaa5-e1c263083557bjorn-spockeli<p>Which SDK and SoftDevice version are you using? Have you ported the Secure Bootloader to be compatible with the S110?The Secure bootloader should revert to single bank if there is not enough space to perform a dual-bank update, see <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/lib_bootloader_dfu_banks.html?resultof=%22%73%69%6e%67%6c%65%22%20%22%73%69%6e%67%6c%22%20%22%62%61%6e%6b%22%20">this</a> infocenter page for more information.</p><div style="clear:both;"></div>