This is a 4/32 router meaning there is very limited flash space. A custom image will be needed to get the full wpad that supports Enterprise authentication. For a beginner it would be best to use more capable hardware.
Also LEDE 17 an old obsolete version and should no longer be used.
I have seen that I must install linux, then imagebuilder, now, what are the minimal image to achieve the result?
too many option to choose for my knowledge
thanks