Have now tried 4 times, same results:
Jailbreak requires the power cord method, reboot, unplug power, DFU
Seas0nPass doesn’t/can’t control iTunes via scripting, so that part is manual
After a successful restore of the SP ipsw, unplugging/replugging the ATV2 causes it to go into fast-flashing mode
Tethered boot makes no difference, same end result.
If anyone actually has this working on an ATV2 with 4.4.2, would love to know how to do it.