On this page
Debugger
Wire up two picos like this
upload this file pico-debug.uf2 to the left pico in the picture using any method from above
Next select the right debugger and run
You can also open serial monitor if you want bc uart is passed through
side note: I don’t use picoprobe or openocd. I use this for those who care pico_debug
Don’t have a second pico?
Just upload this file: pico-debug-gimmecache.uf2
Then choose Duo_Core_Debug
github: pico-debug