RE: DFU from Application Using USB and External Flash on Thingy53/nRF5340

AHaug — Thu, 26 Jun 2025 11:41:20 GMT

Hi,

I will look closer into this, but here's some initial thoughts

[quote user=""]From a post in this forum I understand this error means I am trying to open a flash area that does not exist. I am currently stucked here.[/quote]

This is correct, the way the netcore image DFU works is that you have to temporarily load it to RAM, which can't be opened similar to how regular flash storage is opened (illustrated here: https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/dfu-for-the-nrf5340/). This error ' mcumgr_img_grp: Failed to open flash area ID 1: -2' can be ignored for this image.

[quote user=""]The AuTerm could successfully identify the serial port, but when I try to get the current image, AuTerm only reports Image 1 -> Slot 1 -> with the image state Bootable, neither Active nor Confirmed, which is different from the tutorial. I am using ncs 3.0.2[/quote]

If you have a nRF5340DK available. Do you see the same things when reproducing the steps on the DK as you did for your custom board based on the Thingy:53? I assume there will be differences due to the peripherals, but what I'm curious of is if this is due to a change in NCS 3.0.0 i.e the academy lesson 9 exercise 4 and 5 (for simultaneous) is out of date or if it's a "thingy:53 based" issue

Kind regards,
Andreas