https://devzone.nordicsemi.com/f/nordic-q-a/2155/single-vs-dual-bank-bootloaderCan someone explain the reasons/benefits of using the single vs dual bank BLE boot loader? Actually, why isn&#39;t there a single bank BLE bootloader in the example project in SDK 4.4.2? Is there one added in a later SDK? I ask this because we wanten-USTelligent Community 13Mon, 12 Mar 2018 12:08:18 GMThttps://devzone.nordicsemi.com/thread/123900?ContentTypeID=1Mon, 12 Mar 2018 12:08:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cae020a4-627e-49c0-9278-38e650c8f7f8Mannu<p>Hello Dhruv, can you please tell me how to write SDK12.3 Dual bank DFU.Please tell me configuration for same</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/9143?ContentTypeID=1Tue, 08 Apr 2014 17:36:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ef6b0e4-f6a8-48a4-9108-f875e9a9e4c0Dhruv Raturi<p>Hi,</p> <p>The most important benefit of using Dual Bank is that when you transfer over a new app, the old app still exists in flash memory. So if it is the case that the new app that was transferred over was corrupted in some way, there will always exist a working app that you can revert to. This cannot be said for the single bank bootloader, because the single bank bootloader will write the incoming app to the memory space that already has the original app on it.</p> <p>Hope this helps.</p><div style="clear:both;"></div>