HOW TO PROCESS SDK13 BY OTA FROM SDK11?

[Ethanc]

I TRY TO PROCESS OTA FROM SDK11 TO SDK13, BUT ITS NOT WORK.

WHEN I SEND THE ZIP FILES, IT WILL CLOSE OUT FROM BOOTLOADER.

SO HOW DO I PACKAGE THE ZIP FILES?

[bjorn-spockeli]

See this answer: https://devzone.nordicsemi.com/f/nordic-q-a/18199/dfu---updating-from-legacy-sdk-v11-0-0-bootloader-to-secure-sdk-v12-x-0-bootloader

[Ethanc]

Thanks so much, but I can't find dfu_dual_bank.c in nRF libraries, where should I find it ?

[bjorn-spockeli]

Its in nRF5_SDK_11.0.0_89a8197\components\libraries\bootloader_dfu

[Ethanc]

So it means I need to update three times? 

[bjorn-spockeli]

Yes, updating from the Legacy DFU to the Secure DFU will require multiple updates.