GamesSimulationShadows of DoubtHow to use Shadows of Doubt upgrades and SyncDisksWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. GamesSimulationShadows of DoubtHow to use Shadows of Doubt upgrades and SyncDisksWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. (Image credit: Fireshine Games) The Shadows of Doubt upgrades to your character require SyncDisks, special cyberpunk chips slotted into your neck that grant new abilities. On top of that, SyncDisk Upgrade Vials can further enhance the effects of certain disks, increasing the modifier or chance of bonus that the disc grants you. However, despite SyncDisks and upgrades being some of the most significant rewards in Shadows of Doubt, installing them and how that’s done isn’t made especially clear - so we’ll …