how do i jailbreak my ipod touch 4G running on iOS 4.2.1?

Brady

New member
WIll someone please explain this to me?
I hear it must be by redsnow and it has to be tethered. Does this mean everytime i hit the power button on my ipod that i will have to re jailbreak it again?

also i hear if you downgrade it to a lower iOS then jail break it then it will be untethered even when you upgrade it back to 4.2.1. is this true?

Will somebody explain this to me in english? all input is appreciated.
btw i run on windows
 
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