Update 1: If you’re on iOS 4.2.1, and inject the 06.15 iPad baseband, you won’t be able to restore to stock firmware, or downgrade your baseband to 05.xx.
Explained by the Dev Team:
WARNING â€” YOU DO THIS AT YOUR OWN RISK! Â PLEASE UNDERSTAND THE CONSEQUENCES OF UPDATING TO 06.15.
- There is no way to come back down from 06.15, and thereâ€™s no hiding the baseband version from Apple. Youâ€™ll be voiding your warranty in a very obvious way.
- If some future baseband comes out with a critical fix, you wonâ€™t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldnâ€™t update to it if you wanted to keep your unlock anyway).
- Starting with FW 4.2.1 if you have 06.15 on your iPhone you wonâ€™t ever be able to restore to stock firmware (it will fail). Â Youâ€™ll need to only restore to custom IPSWs (then again, if youâ€™re unlocker you should already be doing that).
Certainly donâ€™t update to 06.15 if you donâ€™t need to! Only do this if you need the unlock and youâ€™re stuck on 05.14 or 05.15, and youâ€™re willing to assume the above risks.
redsn0w 0.9.6beta5 is now available for download for OS X and Windows users. This updated version’s primary purpose is to inject the unlockable iPad baseband into iPhone 3G/3GS units, to be unlocked via ultrasn0w for iOS 4.2.1.
Here was the update posted by the iPhone Dev Team:
Update #2: The new redsn0w 0.9.6beta5 is out. Â It gives both Windows and OSX users the ability to flash the iPad 06.15 baseband on iPhone3G or iPhone3GS. Â It fetches the baseband files directly from Apple for now (the only IPSW you ever point it at is the stock IPSW for the FW on your iPhone right now). Â There may be a long delay while itâ€™s doing this (their servers are currently getting pounded).
- OSX (SHA1 a322ec2c9e91993eca21abaf2e655bb44de3d7d4)
- Windows (SHA1Â 7250416e17c3aea9838cdfc73712b38b025e2ed0) (Windows 7 and Vista users, please run redsn0w in â€œXP Compatiblity Modeâ€)
If you do flash your baseband via redsn0w, please keep it plugged into USB the whole time. Â You donâ€™t want your battery to die during the flash process!
Let us know how redsn0w works out for you. As always, follow the above procedures at your own risk.