A Warning/ Temporary Solution from the Dev Team

[radack1155]

From their website--

your 3GS temporary solution ;-)
Remember we warned you to stay away from any updates to 3.1 if you want to be able to jailbreak or unlock your 3GS.
Well this is an additional message to all you 3GS owners that would like to jailbreak your device sometime soon, but this advice comes with a warning! A warning that if you accidentally upgrade to 3.1, you will not be able to use Ultransn0w, so please re-read and double check this warning at the bottom of this post before proceeding.
You may have read or heard about techniques to capture files during the iTunes restore process. These will be required to jailbreak your phone in the near future, most of the methods involve icky USB snoops. Well, there is an even better and more reliable method to get your hands on those lovely files.
During the restore process iTunes nicely keeps these oh-so-top-secret-files in a lovely accessible place for us to copy out and backup, that place? /tmp on Mac OS X or %TEMP% on Windows. Thanks Apple — handy!
The downside to this approach is that you actually need to go through the restore process to get these signed files, which has risks if you are anywhere near 3.1 or 3.1 beta :-)
If you are ready to proceed and you know the risks we’ll get down to the nitty-gritty -
So during a usual recovery with iTunes, your signed iBEC is written to /tmp and during a DFU mode restore the signed iBSS is written there also. To be sure, restore in both modes one after another to be able to grab them both. You’ll need to keep an eye on the temp directory and copy it before it is deleted again by iTunes. I’m sure some nice folks will create a tutorial about this, we’ll link to the first person who makes a good one.
Should you choose to accept this mission, act fast, this needs to be done quickly! But again, always, always double check here to see if 3.1 has been released, if is has, then don’t do this.
WARNING!! - DANGER, WILL ROBINSON! - NB! - REMEMBER!
IF YOU CARE ABOUT ULTRASN0W, BE VERY CAREFUL WITH THIS METHOD! Do not attempt this if you have downloaded the 3.1 beta. You do NOT WANT TO accidentally restore your device to 3.1 beta — you’ll lose ultrasn0w if you do! BE WARNED :-)

[dvigue]

what do i do with these files after? save them for future use??

[carrera.owner]

That convoluted message left me lurking through the comments on their site to figure out how to do it. The following is what worked for me (originally provided by BoingBoing in the comments section at http://blog.iphone-dev.org):

->Open terminal
-> mkdir jbsb
-> make a backup of the current state of your iphone
-> Do a restore (I simply did used the restore button on iTunes)
-> when the progress bar on the iPhone is about half way copy the *.dfu files via:
cp ~/Library/Caches/Cleanup\ At\ Startup/iPhone\ Temporary\ Files.noindex/Firmware/dfu/* ~/jbsp
-> Let iTunes finish it's thing.

When done, if you cd over to jbsp and execute ls -l you should see:
-rw-r--r-- 1 username username 104772 Jul 1 23:37 iBEC.n88ap.RELEASE.dfu
-rw-r--r-- 1 username username 104772 Jul 1 23:37 iBSS.n88ap.RELEASE.dfu

Yes, save these files for future use.....