how do i use this tool?

[FirewallDaProtogen]

i see no instructions basically whatsoever, especially on important things such as weather to choose arm little or big endian, the architecture varient, etc.

it is not configured by default either

is there a file that contains the configurations? i have no idea

[kleo]

you can follow the build steps on here https://github.com/linux-3ds/buildroot/blob/master/.github/workflows/build.yml