I did the the first time I played and then I realized the mistake. If you pick the highest difficulty in the game, you won't be able to rush through the main st

I did the the first time I played and then I realized the mistake. If you pick the highest difficulty in the game, you won't be able to rush through the main storyline because your character is under-powered. You'd then need to play the side mission in order to accumulate gears and cybernetic stuff. That makes the game even more interesting. Try it again with the hardest mode.