More Arduino setup confusion. Can't find bootloader

[psupine (Mark Jeffree)]

This was working last week and I have no idea what I’ve changed.

The IDE is Arduino 1.8.19, the target is a RAK4631-RUI3 (host is Win 10)

I’ve gone right back to the Arduino_Led_Breathing example. The libraries appear up to date and I have the board configured as the RAK4631.

The verification button yields this error:

I have found “bootloader_nrf52840_rak4630.hex” at

C:\Users\markj\AppData\Local\Arduino15\packages\rak_rui\hardware\nrf52\3.5.3\security\prebuilt

which seems an entirely reasonable place. Any ideas on what I’ve broken?

[carlrowan]

Hi @psupine ,

I am not really sure what is the cause of the error but since it seems to be related on hex file. I looked at on my own installation (that currently works fine) and I found out we have different location. Please check mine on the image

[psupine (Mark Jeffree)]

Much obliged @carlrowan.

I copied the prebuilt directory out from under the “security” directory and the Arduino builder is happy again.

I spent the weekend trying to get VS Code running Arduino (still trying) and found that a load of the Extensions were disabled because they weren’t “trusted”. That has the same smell as hiding prebuild executables under a directory called security. And this whole business of the OS trying to prevent me from using the things I’ve downloaded is consistent with having moved to Win10.

So thanks again for your help.