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I got it from a mirror site.

This is Untethered 4.2.1, right? Do I need any old 'blobs' or can I just do a brand new 4.2.1 and go straight untethered?

I'm still trying to find out details, it was just released, but yes, it is untethered, and as of right now, only for Mac
 
chpwn

(Be sure to restore before using if you're currently tethered, and do note that it is currently Mac *only*.)
21 minutes ago via web
 
MuscleNerd

We'll update PwnageTool with this 4.2.1 untether if we get the okay from cdev. Good job @pod2g and @chronicdevteam!
2 minutes ago via web
 
do i need to have the stock 4.2.1 loaded first? I don't want to update my baseband

Yes, then don't do it if you like being unlocked. This is for those poor OOB people.

@#$%@#$%$ The longest part of this is downloading Cydia through the "loader" application.
 
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