~Windows Only~
You can use this lil thing to put your iphone in DFU recovery mode so you can downgrade it. Also very easy comparred with getting the timing right with the buttons
I got the files from iBrickr when i downgraded a locked 1.1.1 to 1.0.2

1. unzip this archive = http://www.s___space.com/file/2rdyd8 (send )
2. drag the "drag_me" file onto the dfu file with your iphone plugged in.
3. your iphone will goto normal recovery mode, then blink a few times and finally turn completely white.
4. shift+click "RESTORE" and select your FW

To Mods or Admin, if you feel this deserves a sticky it may be helpful for newbs and the uncorridinated

Just to clear things up, DFU and recovery mode are different, right? DFU mode is when the screen turns white? Either way I cannot restore 1.1.1 in recovery mode but I can in DFU (white screen) just fine (error 1015 of course).

After I put the unit into recovery mode, I unplug it and plug it back in, the screen turns white (at least mine does). and wolaa it's in DFU mode. I can do a restore to 1.1.1 no problem. Why are there ways (and software) to put it in DFU when all I have to do in unplug and plug it back in? Assuming the white screen is DFU Thanks.

I have week 42 with 3.9BL

well you dont have to plug it back in just leave it... when itunes comes up saying its in recovery mode just say ok and ok the next message then you can do it..

i think the difference is, normal recovery allows you to reflash the FW you had and DFU recovery mode allows you to reflash to anything

ive never had to unplug it.. all i did was that drag and drop thing and waited like 15 secs and the screen goes white