Where and how?
Crafting and upgrading can be performed through the Crafting panel in the main menu. You will need a Crafting Spec and necessary components to craft or upgrade an item.
Item Tiers
Crafting Spec's color indicates the quality of the item you are crafting. Item quality levels range from Tier 1 to Tier 5++.
Components and Crafting Specs
Crafting specs can be found as loot or purchased them from vendors. Components can be looted or obtained by disassembling items of the corresponding tier (e.g. Tier 5 components for disassembling Tier 5 items).
Iconic items
You can increase your Iconic weapon’s stats and upgrade it to the next Tier in the Upgrades tab in the Crafting menu, provided you have the necessary components.
Upgrading Cyberware
You can also upgrade your equipped cyberware at ripperdocs by using item components corresponding to its quality.
Check Database in-game to find out more!