Make to use save 1 first! This is on the level Lockdown! Modded the save for invincibility, unlimited AR ammo and saw ammo, 127 of each grenade type. Save 1 is after I have destroyed the flying covenant ships and have entered the structure (right after the door opens). You will need to play this save to destroy the two spheres, then head back outside, fly pelican, destroy covie ships, enter structure. When you get to the gondola Cortana will mention about using your shield as an emp, save and quit there. Now save 2 will start right there with invincibility, unlimited saw and suppressor ammo (works better on Knight's shields), and 127 of all grenade types. Just do the playthrough/runthrough to complete the level and get the 30000 xp.

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Save 2: [ Register or Signin to view external links. ]

Credits: @Inx