Reverting Firmware - Jailbroken ATV2

I have a jailbroken ATV2, currently running 5.3 (tethered) and have installed ATV Flash.

I bought the ATV2 used and it was already running iOS 5.3.

In ATV Flash under settings, iOS 5.0.2 and 5.2 are listed as being able to be restored using Seasonpass.

So does this work ok ?

Will be able to re-jailbreak untethered using theses versions ? If so which version should I use ??

Any info appreciated.