seas0npath want to install 5.0 image, but i want 4.3 - preference settings doesn't work

I have an ATV2 with 4.3 (it shows under info 4.4.4 - is this the 4.3 Version?!?), i want to Jailbreak them - so that i can use my bought tav-black flash, for this i start Seas0npath and set in the preferences ATV2,1_4_3_8F455 and exit Seasonpath and start it new, i check the settings and the show me the right firmware.

But if i start the seas0npath and want to update my atv2, i see in the firmware folder only the is the 5_0 Version created - but i want untethered boot.

How i can jailbreak my atv2 with the 4_3 Firmware?!?