There's a specific point on Feros where all you need to do is cast AI Hacking, recharge and rinse/repeat.
Once you first talk to the colony, you will be required to 'clear the geth in the stair case (up in the area where the elevator to the prothean skyway is located).
In the end room where once you finish you'll see the geth ship fly away, do not kill any of the Geth Snipers located. Once the only enemies left are the sniper/snipers, all you need to do is take cover on a small block located on the floor and cast your hack, no moving around, no saving/loading the game after each time.
Obviously your skill needs to be substantial enough to hack the geth, but by the time you reach Feros, im sure you'll have the ability to do that.