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What is an Upgrade Item in World of Warcraft? Upgrade items are items that can be added to weapons, armor and trinkets to boost their stats. You can get it by completing high-tier keystones dungeons. Trainers will require an upgrade in order to evolve Porygon's final evolution, Porygon2. But, they won't be able to grab one by spinning PokeStops or Gyms; these special evolution items have a very low drop rate. Components In computer technology the term "hardware" or software" refers to a hardware upgrade replaces an older version with a more recent version that comes