Jailbreaking on iPad 4.2.1

I was trying to update my friend's iPad from 3.2 to 4.2.1 with jailbreaking (for now, the thethered version).  Unfortunately, it didn't work out as nice as I expected.  Jailbreaking process didn't give me any error (I was using redsn0w_win_0.9.6b4), and all the machine setting was being preserved.  However all the jailbroken apps failed, and even the Cydia was not working.

Also I was not  able to get redsnow working on my Windows 7 64 bit machine.  But it works fine with my MacMini.

But then I thought, maybe it's because I wasn't doing a clean restore.So I did that, but still the Cydia was installed and not running properly ... .UNTIL I realize that in order to make the JB work, I have to run redsn0w_win_0.9.6b4, go thru the first 2 screens, and then select thether reboot.  After I did that (both on my Mac and Windows and they both work fine), I got Cydia and Installous running properly.

Well, at least now I know how to make JB working on 4.2.1.  Sweet.  I'll probably keep my iPad running 3.2 for a while though.  Don't see a huge reason rush to update.

And damn, come to think about it, maybe I really do not need to wipe my friend's iPad :-E