GUIDE: Jailbreak iPhone 3G and iPhone 3.1.2 firmware 3GS with Blackra1n for Mac
Upgrade iPhone to 3.1.2 via iTnunes if not already updated.
If you do not have the firmware can be downloaded from here:
Requirements:
Blackra1n for Windows download directly from the official site by clicking here and then the Apple logo.
Connect the device to your computer via USB (to be turned on) and close iTunes.
Guide:

1. Click on the icon of Blackra1n to start the application. A small window with a single button “Make it ra1n”
2. Click that button, and you’ll notice the words “Entering Recovery”. In those seconds, the program will launch a completely automated process that will put the iPhone / iPod in recovery mode and then run the Jailbreak and install the application on the device Blackra1n.
3. IPhone GeoHot image will appear full screen on Mac and meanwhile you will notice this in writing:
4. The Jailbreak has been completed and was successful. Wait those 20 seconds it took to restart the phone and when you are on the SpringBoard will not have to do is launch Blackra1n through the appropriate icon, and download Cydia.
End! You can enjoy your device updated, unlocked and jailbroken with the latest available firmware and Cydia. The whole process, even counting the time for a restart of the device, takes about 30 seconds!
Restore backup or set up as new iPhone?
We do not recommend backup restore through iTunes if these were made by a firmware 3.0.x. A substantial firmware update results in significant changes that often a backup can change, compromising the proper functioning of the device. It ‘always advisable to configure your phone as a new device .. up to run a manual backup (via SSH) only for SMS. For the address book, mail, bookmarks, applications, music and photos, to do a new sync with iTunes. For applications Cydia, reinstall only those necessary.




it said it was done and to wait for reboot but when i looked at my ipod nothing was different and it didnt have the blackra1n icon or cydia icon anywhere i dont see where i screwed up i followed the steps
[...] Jailbreak iPhone 3G and iPhone 3.1.2 firmware 3GS with Blackra1n for Mac [...]
Hello can u help which one i have to download for my i phone 3gs
hi everybody,I have iphone 3gs, 3.1.2 .wanted to jailbreak it,first of all I was never able to restore it by clicking shift+restore,”firmware is not comaptible” pops up with any kind of ipsw..secondly I installed blackrain to windows and did run it,it said it is jailbroken,easiest way bla bla,iphone showed geo logo,and then black screen came,blackrain said “done, waiting for reboot,” i waited for reboot which never happened,then i held power button for a while,but nothing,then I held power and home again nothing,then I hold power home together and released power but not home button(getting out fromdfu mode) nothing happened,no apple logo no geo logo,just black screen,before doing jailbreak i had usb logo,but now nothing..I was not able to restore before,and not able now ,it always writes “firmware not compatible” what should i do to get rid of these 2 things,,I know that i am not a only one who had this problem,I have read different forums,most of them write stupid answers,”change usb cable port bla bla” which is not helpfull atall..before responding consider
that i read some answers as run blackrain again,ofcourse I will run it before posting please respond if you fixed the problems i have.thanks
blackra1n stops responding after it sets my iphone into recovery mode. Help, please
god it deleted EVERYTHING
What package do I need to jailbreak this fone
please help
Where and what package do I need to unlock the 1st gen iphone
DOES NOT WORK. MY ITUNES KEEPS POPPING UP ON PHONE IN RECOVERY MODE, AND ON MAC TELLS ME TO RESTORE, BUT YOUR ADVICE SAYS NO. IM CONFUSED BECAUSE I CANT GET PAST THIS SHOWING ON MY PHONE UNLESS I RESTORE MY ITUNES. WHAT DO I DO NOW?
THANK YOU.