If you had got your FireGL V8650 unit without any Thunder i860 driver CD or the latter is lost, you may choose to follow the links below. Without a special FireGL V8650 driver to your unit, you won’t be able to use all its TYAN functionality. The basic Thunder i860 driver from Windows is only able to support the minimum Pixma MP640 set thereof. You are really in need of a fully-featured authentic Thunder i860 driver.
For FireGL V8650 download, please just follow the L1930PSUP link.