software update from apple for aTV2

If I update, as asked from apple for the aTV2, will it be possible to use aTVflash if it is available?

Currently it's looking like the first beta of aTV Flash will be compatible with the 4.0 software only. This may change, but there has not yet been an official jailbreak released for the new 4.1 AppleTV software.

THX a lot, the answer was very helpfull :wink:

Will it work on soft 4.2.1 ???

aTV Flash currently will not work on 4.2.1 (aTV version 4.1). 

When will work on version 4.1?
Can I go back to version 4.0 as I have uploaded version 4.1?