As it is not cost-effective for the company to send new recruits into the beast with the most premium gear, your equipment has been designed to be improved in the field.
The equipment that powers three of your actions (Stun, Eliminate, Capture) can be upgraded, either via the Upgrade action or the Wrench tool.
When you upgrade an action, remove the Upgrade tile from the board.
From that point on both the basic and the upgraded version of that action are available.
If one of your upgraded actions is downgraded, place the corresponding Upgrade tile back in its starting space on your terminal.