Best Current Method - Untethered JB For 4.2.1

[BzowK]

Hey All -

I've got an iPhone 4 with 4.1 (J by RedSn0w) currently applied. Due to a few apps that I want to get which require 4.2, I want to go ahead with the upgrade.

I know that RedSn0w has a beta untethered JB, but didn't know if that's the latest and greatest amongst all different methods (limera1n, greenp0ison, etc).

I Googled for it, but there's so many knock offs that I wanted to be safe so posted here.

So what's the best method for a untethered JB of 4.2.1 today? Any links with steps would be appreciated.

Thanks!

[Simon]

Only untethered jailbreak on 4.2.1 right now is redsnow 0.9.7b6. It is mac only and requires you to have 4.2b3 SHSH.