What's the date code (first 4 digits of the serial number) on your 221?
If it's 2005 or lower, your unit has a hardware limitation that excludes it from TOS 6 builds per this thread.
If it's 2005 or lower, your unit has a hardware limitation that excludes it from TOS 6 builds per this thread.
Statistics: Posted by crisisacting — Yesterday, 07:31