NRF52 - Secure Bootloader CRC Failed

[Andre]

Hello,

I have some trouble to use the Secure Bootloader example, which comes with the nRF5_SDK_12.1.0

I installed the latest nrfutil and hexmerge. I can compile the bootloader (use Debug mode). Then I merged the hex file with the S132 Softdevice hex file. So far no problem.

But doesn't matters, if i use my self compiled bootloader or the bootloader image which comes with the SDK, the upload always failed with my own Application package (zip). When I use the example App, it worked in always.

CRC Failure

Here the way I made all the stuff:

Compile the bootloader

Creating the Bootlaoder settings hex

Uses Blinky from the examples to create a application.zip - Signing the file / Key is generated with nrfutil

Compare the self made "Zip-Files" with the Example

With the example the upload is successfull

So what is the Problem with the CRC? I read the other thread, but this is not the same SDK Version there. It's different to the 12.1.0 with the secure bootloader.

Hope, you can give me some clues.

Regards, Andre

[FormerMember]

When you create a .zip for uploading via DFU, I see that you use the private key in the file privatekey.pem. Did you remember to add the corresponding public key to the bootloader (dfu_public_key.c)?