Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
undefined
That entire config.g file is intended for RRF2.
I suggest you generate a new config file set for RRF3 with the config tool and customize from there.
https://configtool.reprapfirmware.org/Start