This page contains BioHazard 4 Unlockables for Playstation 2 called "Upgrades" and has been posted or updated on Oct 3, 2007 by jkalebh930. Let us know what you think of this Unlockable by thumbs voting.
Once you have fully upgrades every stat for a specific weapon, you can purchase an expensive "Exclusive" upgrade for that weapon. Note: Killer7 has no "Exclusive" Upgrade.
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