Triggering to swap the 2 images

[AElnahas]

I used FOTA download library to download a new image from http server , then update the image by swapping the 2 images
Now , the old image is in the external flash and the new one is running in the internal flash

Is there's a way to trigger the SW and reboot to swap again to retrieve the old image ?
What are the steps that must be done before rebooting to do swapping again ?

[Kenneth]

Hello,

If you haven't already, you may find our webinar and devacademy course on our DFU implementation useful:
https://webinars.nordicsemi.com/events/13137619996 
https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/ 

The short answer to your question is that there is no direct way to swap between images no, but there is some functionality to test a new image, and then you can revert or confirm the new image (from the new image). So it's partially possible, but not the way it's intended to be used. Though the above webinar describe the details better.

Kenneth