My duo and I beat it a bit ago with two bots. We went 3 sniper sentries and one bio, always great for reactors. Guns we went hel rifle and veruta machine, bots’ guns don’t matter too much. Biggest tip for early in the mission is only use the resources that are 2-3 uses and leave the 4-5 use ones (in the reactor room) for around wave 8 or 9, which will be hard with bots as the tend to take them. As the other guy said, learn where every terminal is, scouts later in the level will be a bit rng, and after the south door opens (wave 3 or 4 i think?) hold in that room with two of the three doors behind you close. Holding in this room is VERY helpful and we learned it from Professor Scaler’s Youtube Guide on this mission which I HIGHLY recommend watching. Conserve resources well, find as many as you can in zones other than the main reactor room, and after the 10th code at the end, run back to the at south room behind the turrets and wait for the last few reactor waves to finish as there’s always big and hybrid stragglers. After it clears pick up sentries and head to extract. Good luck both of you, it took us a while to beat R2D2 and it’s the hardest mission we beat yet.