Be warned, ACLRp is much harder on PSP due to difficulty of looking up and down. And if you are stuck/ don't want to do missions, i have a save file. Armored Core Last Raven Portable Save File for PSP
AC1 when i was like 5...? AC2 when i was 7 (When i figured out that you could sell parts to buy a machine gun i was excited!) AC3 when i was 11. (Never finished due to loss of game) AC4 when i was 13. (Quickboost is funnn!) ACFA when i was 13. (White Glint your sexy.) AC3p (Finally finished AC3's story!) ACSLp (Silent line is FUN!) AC1 on PSP (Finished it) ACPP on PSP (Stopped due to LRp) AC MoA on PSP(Never started but i have it) ACLRp Just recently. (I now know why it is hard.)