How do I unlock rank 4 parts for the Zaku II (Char)?
Unlock and clear the “Char’s Challenge 2” Extra Mission. To unlock the mission, you must max out your relationship with Char and have shot down 5000 or more units while piloting Char’s Zaku II (combined total for all pilots). You must also clear the “Char’s Challenge” Free Mission, which is unlocked after you clear Char Aznable’s Story Mode and is playable for Char only (you’re also restricted to one player and must pilot Char’s Zaku II during this mission).
