If you had got your ScanJet N9120 unit without any Stylus T21 driver CD or the latter is lost, you may choose to follow the links below. Without a special ScanJet N9120 driver to your unit, you won’t be able to use all its Epson functionality. The basic Stylus T21 driver from Windows is only able to support the minimum X520 SU4100 set thereof. You are really in need of a fully-featured authentic Stylus T21 driver.
For ScanJet N9120 download, please just follow the G50Vt-EP024G link.