How to jailbreak version 4.2.1 iphone 4? i've tried redsnow: http://www.youtube.com/watch?v=95uTZqGUVNA

but it fails (when i try to enter cydia, i immediately exit & there's a bug with safari too). Recently I had it jailbroken with limerain before, but after I updated it to 4.2.1 it just f-ed up and now i'm back at square one. Help anyone please?

e: sorry if this has been posted many times, but help would be apprecciated.

This post was edited by LEGlT on Jan 4 2011 10:30pm

Restore it to factory settings from your computer.
Than rejail break it.

I jailbroke my iphone, but it says i need to boot as tethered everytime i need to access JB apps or cydia.. this is for 4.2.1, does it mean I have to tehter it everytime i need to use like say... sb settings?

Buy an Android phone.

/problem solved.