Impossible to build USB DFU sample with toolchain&sdk v2.9.0, v2.8.0 & v2.5.0

[Thibaud]

Hi

I am trying to use USB DFU sample on a nrf52840dk/nrf52840 but I can't build it, I have this errors : 

Best Regards

Thibaud HABRAND

[Thibaud]

I've found a solution you need tp siabled sysbuild in build configuration.