location info is incomplete error

Problem: Using cargo run –bin hello from within the nrf52-code/radio-app folder finishes compiling and starts up probe-rs. But then the following error is returned:

Running `probe-rs 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-rs works fine again.

Untested: using nrf-recover may also work.