Jailbreak semi-tethered your iphone using sn0wbreeze 2.9.3

Well,
for those who want to update there iphone 3g/3gs baseband to 6.15.00 using iPad baseband, then use sn0wbreeze 2.9.3 on windows.

you can create the custom firmware with latest iOS 5.1

for that you need (download links are given with the names)
1- iOS 5.1

Here are the official download links to iOS 5.1 directly from Apple:

• iPhone 4S
• iPhone 4 (GSM)
• iPhone 4 (CDMA)
• iPhone 3GS
• iPad 3 WiFi
• iPad 3 GSM
• iPad 3 CDMA
• iPad 2 WiFi
• iPad 2 GSM
• iPad 2 CDMA
• iPad
• iPod touch 3G
• iPod touch 4G
• Apple TV 2G (5.0)
• Apple TV 3G (5.0)

2-iPad firmware
3-Sn0wbreeze for windows
4-windows pc

Procedure is simple

1- download the softwares
2- open sn0wbreeze
3-go to expert mode and when prompted click yes on upgrading to iPad baseband,
4- build custom firmware
5- then put your device in DFU mode using sn0wbreeze or Redsn0w
6-then open iTunes and restore it with that.

voila.

done..

you have updated your iphone 3g or 3gs to iPad baseband with iOS 5.1

Now you can use fuzzy band and downgrade the baseband to the ones unlockable or
you can try ultrasn0w to unlock it.

how to update iphone 3GS/ 3G baseband to 06.15.00 using pwnage tool

Update-
Please note that since apple doesn’t sign older iOS softwares, so please makes sure that you use the latest software for the jailbreaking or unlocking of yoursoftware.
for eg- in this post I have mentioned ios 4.2.1, but in actual this software cant be used to jailbreak or restore your iDevice as apple is not signing any other iOS except iOS 5.1
so use 5.1 instead of the version mentioned here.
Rest all process remains same.
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Update-
for udating your baseband on 3g or 3gs, you can’t use quickpwn, so for this you need to use 
sn0wbreeze ant that too on windows.
please download your copy of sn0wbreeze from here

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hi friends…

please make sure that there is no turning back..

WARNING — YOU DO THIS AT YOUR OWN RISK!  PLEASE UNDERSTAND THE CONSEQUENCES OF UPDATING TO 06.15.

1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail).  You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).

1- Download pwnage tool 4.1.3  for mac or windows  from this previous post here

2-download ios 4.1 or 4.2.1 as per your current version

3- download ipad 3.2.2 ipsw from this blog post

launch pwnage and select your device, go to expert mode and select the ipsw firmware  as told in step-2

4- read the waring and understand it which comes when you press next as you will be voiding all the warranties once you update to ipad firmware.

5-next browse for ipad firm ware as download 

it will club the baseband and then let the pwnage tool build the custom firmware and place it on the desktop.

6- get your phone in DFU mode as told by the pwnage tool

7- restore with itunes with the custom firmware placed on ur desktop. Clik Restore while pression option on your keyboard.

when restore completes

 1. Launch Cydia and go to the ‘Manage’ tab.
2. Tap ‘Sources’.
3. Tap ‘Edit’ at top right and then ‘Add’ at top left.
4. Enter ‘http://repo666.ultrasn0w.com‘ and tap ‘Add Source’.
5. After Cydia downloads the packages and completes updation of it’s sources, search for ‘Ultrasn0w’.

after your phone starts you should be able to use any SIM

enjoy..