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nRF52840, DFU issue

Hi All.

SDK15.3.0 / DK / nRF52840

I've been testing DFU on nRF52840 with DK.

When i tested it on nRF52832 all works fine. i followed this (https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader)

e.x) flasing merged image (secure_bootloader + bootloader_setting + SoftDevice + Application)

But when i did the same thing to the nRF52840, it didn't work

The nRF studio said "This hex file has data in SoftDevice region" which happend on nRF52832 too. but case of nRF52832, it was solved with merging images. 

but in case of 52840, it was not solved.

and when i flashed on IDE which is segger, Secure_bootloader_example, it worked. but whether merging images(softdevice, secure_bootloader) or not , on nRFgo, it didn't

what's difference between flashing on IDE and nRFgo?

please let me know how i solve this problem.

p.s) it din't work on SDK v15.2.0 too 

thanks.

regard.

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