https://devzone.nordicsemi.com/f/nordic-q-a/74149/nrf5340-single-bank-fotaHi, I was evaluating FOTA on nRF5340 as possible upgrade to 52 series. All went good which I&#39;m happy of. However application size is limited roughly to half flash size remaining after subtracting space occupied by MCUboot and it&#39;s scratch area. Ifen-USTelligent Community 13Tue, 20 Apr 2021 07:32:41 GMThttps://devzone.nordicsemi.com/thread/305717?ContentTypeID=1Tue, 20 Apr 2021 07:32:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0f37a01f-89d8-4be4-b9e4-559ab505af6cAmanda Hsieh<p>Hi Tomasz,</p> <p>You could do serial dfu within the bootloader itself. Otherwise, it has to be &quot;dual banked&quot;.&nbsp;To do DFU with UART on nRF Connect SDK you would need to use <a href="https://docs.zephyrproject.org/1.13.0/subsystems/mgmt.html">mcumgr </a>and <a href="https://docs.zephyrproject.org/latest/samples/subsys/mgmt/mcumgr/smp_svr/README.html">smpsvr </a>and enable the serial recovery in the mcuboot&nbsp;(<span style="font-family:inherit;">check some similar posts like </span><a style="font-family:inherit;" href="https://devzone.nordicsemi.com/f/nordic-q-a/66827/unable-to-use-mcumgr-cli-over-serial-from-windows/301326#301326">this</a><span style="font-family:inherit;">&nbsp;and </span><a style="font-family:inherit;" href="https://devzone.nordicsemi.com/f/nordic-q-a/58477/nrf5340---uart-programming-option/237663">this</a>).</p> <p>-Amanda H.</p><div style="clear:both;"></div>