Using the nRF54L15-DK, lesson 9 exercise 1 part 3 of the nRF Connect SDK Intermediate course fails to flash with "Device error: Address 0x00000000 is in a protected RRAMC region (Generic)"

[Dazai]

I am going through Lesson 9 of the nRF Connect SDK Intermediate course to understand how DFU and FOTA work in the SDK.  I am using toolchain and SDK v3.1.0, and nRF Connect in VSCode.  Exercise link: academy.nordicsemi.com/.../

I was able to get through the first 2 parts of the exercise successfully, but after following the steps in part 3 (Add DFU over UART to MCUboot), I get the following error when I attempt to flash the DK, even after doing a pristine build:

I'm not sure why I'm getting this error.  I've tried power cycling the DK and rebuilding, but no luck.  Did flashing the project in step 2 somehow lock the MCUBoot flash area?  How can I fix this?

Details

Memory report after pristine build of part 3.  I've also attached prj.conf, sysbuild.conf, mcuboot.conf, and mcuboot.overlay to this post.

[Dazai]

This works now, I think doing Erase and Flash fixed it.  Ticket can be closed.