'Error: AP ApAddress { dp: Default, ap: 0 } is not a memory AP' while flashing nRF52840-DK

[nkrackow]

Hi, I'm leaving this here in case anyone else is running into the same issue. I have not found much while googling.

Problem: Using cargo run --bin hello from within the beginner/apps folder finishes compiling and starts up probe-run. But then I get the following:

Running `probe-run --chip nRF52840_xxAA target/thumbv7em-none-eabihf/debug/hello`
(HOST) WARN  (BUG) location info is incomplete; it will be omitted from the output
Error: AP ApAddress { dp: Default, ap: 0 } is not a memory AP

The LED5 next to the FTDI chip on the DK goes off for a split second but no program is flashed.

Solution: It seems like my nRF52840-DK was shipped with the MCU in some kind of protected state. Using nrfjprog from the nRF command line tools you can run nrfjprog --recover which makes the MCU exit this state and programming etc. using probe-run works fine again.

[nkrackow]

nrf-recover also works for this, just also erases the MCU program flash :)

[zoodirector]

Dear @nkrackow
Thanks so much for writing this down here! Had the same issue, could fix it with your note!