3G phone 3.0.1 (PT jb'd) to 4.1 using PwnageTool 4.1.2 issues:

While following the PT (PwnageTool 4.1.2) instructions,
-IF you select YES to "Already Pwned", PT says "Use Recovery Mode" and exits.
-IF you select NO, PT requires DFU mode.

Results ........
---- Recovery mode did NOT work! Error 1600/1604 ....
(Sometimes a quick 1600, other times 1604 after 10 minutes)
---- DFU mode worked perfectly --- the 1st time SUCCESS

Successful restore using an old 450MHz PPC iMac w/10.4.12 Tiger and the latest iTunes allowed (I think it was 9.1.x or 9.2.x)

As always, congrats to our honored DevTeam.