The Callisto Protocol has a unique upgrade system similar to its inspiration, Dead Space. While at the Forge, players can use Callisto Credits to purchase upgrades, but all purchases are finalized after being bought. Every weapon and the GRP have upgrades that get more expensive the higher up they go. There is one way of testing these new upgrades before continuing, but it requires a bit more time to set up. This is how to try upgrades before purchasing them in The Callisto Protocol.
Can you change upgrades in The Callisto Protocol?
The direct answer is no. Once something is purchased from the Forge in The Callisto Protocol, there is no refunding it. This can lead to buyer's remorse when printing out a schematic that players don't like or getting an Alt Fire upgrade that they don't like.
Related: How to kill the Two-Headed Abomination in The Callisto Protocol
Of course, you can alleviate this by manually saving before purchasing the upgrade and testing it out. You can always reload the save if players find the weapon lacking. This can happen accidentally between checkpoints and require Jacob to purchase his upgrades repeatedly, so manually saving is important to save time before difficult game sections.
For more weapon guides, check out Combat basics in The Callisto Protocol here on Pro Game Guides.
Adam Aguilar has been playing a variety of genres since childhood but gravitates towards story driven RPGs like the Final Fantasy series or horror games like the Resident Evil and Silent Hill series. He enjoys analyzing themes found within video games and has been writing about them for over 5 years now. As a Contributing Writer for PGG, Adam has been known to cover anything from Phasmophobia to Genshin Impact!