Grevey and iOS6

[E2EK1EL]

Indeed iOS 4.1 is still signed, but not 100% fully and I'll explain it later in the post. Which is strange, but it's a life saver for many people who have the 3GS.

During the dark times of 06.15.00 on iOS 4 w/ the 3GS.

THANK GOD iOS 4.1 is still somewhat has access to the Apple's server some how, starting in iOS 4.2, there was a internal baseband checker and this checks if your iOS ver matches your baseband. At that time if you tried to preserve or loaded that dreaded iPad baseband of 06.15.00, kicking it out of DFU mode would send it into a infinitive boot loops. I learned this the hard way on the night the Dev Team released the unlock and instructions on how to manually apple the iPad baseband. It took me 4 hours to figure out what to do and there was no instructions to restore it since it was too new.

Of course later down the road, everyone else came out with their DFU mode kicker which is big help, since RecBoot couldn't do the job after iOS 4.2 and beyond.

From my personal experiences and observations with loading custom / stock IPSWs, loading the new iOS ver on public launch dates, preserving basebands and etc. There are 4-5 stages which iTunes communicates with Apple's servers to complete or reject a firmware you are trying to load.

1) IPSW verification version check, signed or not signed
2) IPSW verification check
3) Activation
4) Baseband verification check (external)
5) IMEI Factory Unlock verification check (longest check time)

Loading a IPSW when the public release day of a new iOS ver is painful, which everyone has felt in the past. The activation server can't seem to handle the amount of traffic and sends your restore or upgrade back to DFU.

The external baseband verification checker which is the final check point with restoring your iPhones in iTunes. If the iOS ver is still official signed, the baseband server will allow the baseband to downgrade to the previous ver and if it's not, we know it send it into DFU and you'll have to use whatever software of whatever team has figured a way to kick it out. Persevering your baseband also happen at this momment with Tiny Umbrella, which uses their TSS Servers to block this verification check point. Snow breeze builds a new IPSW, but handles it the same way. There were also a "ghetto" way to perverse your baseband with iPhone 3G, which you time it at 36 secs (can't remember it's been ages) and you pull the sync cord to stop the external baseband checker. Not a wise thing to do, but some kids couldn't wait and this was their method at the time.

[E2EK1EL]

Totally forgot about the iPhone 3G Vietnam Hardware Unlock



"Dong Ngo reports for Cnet on the hardware unlocking progress employed by local mobile shops in Vietnam. He writes about witnessing how Tuan Anh Do, a 29-year-old businessman who owns five cell phone repair shops, hardware unlocks the iPhone 3G.

First, a technician opened up the phone and stripped it to the motherboard. In his skillful hands, the device seemed much easier to dismantle than I expected.

The technician then extracted the baseband chip, the component that controls the connection between the phone and the mobile network, from the motherboard. (This is a painstaking task as the chip is strongly glued to the phone's motherboard. A mistake during this process could brick the phone completely.)

Once the chip was extracted, it was Tuan Anh's turn. He used a chip reader to read information into a file. He then used a Hex editor to remove the locking data from the file, and after that, the chip got reprogrammed with the newly altered file. Now it was no longer programmed to work with only a specific provider.

The chip then got reassembled into the motherboard, another painstaking process.

As a last step, the technician put the phone back together, and it looked like nothing had been done to it. However, the phone is now unlocked and can be used with any carrier's SIM.

Each unlocking job takes about an hour to complete and costs 1.2 million dong (about $80)"

http://www.iclarified.com/entry/comm...commentsanchor

[overdrive31]

Never had any clear clarification until running across this PDF on the subject while reading through MuscleNerd's twitter stream trying to get some details on the upcoming 3G/3GS iPad baseband downgrade.

I knew about the dis-assembly method and have advised on it only as a last resort for extremely determined individuals. It is fairly impractical, to say the least, when you can sell your phone and trade up to a unlocked for half the difference and the risk is much less.

[E2EK1EL]

Watch MuscleNerd Explain the Evolution of iPhone Baseband and Unlocks [video]

Watch MuscleNerd explain the Evolution of iPhone Baseband and Unlocks at HITB2012.

Since the first iPhone in 2007, the baseband that Apple uses for cellular communications has evolved in terms of both hardware and software. Some of the changes were minor but others were quite drastic and obviously aimed at deterring carrier unlocks. This paper details the most interesting of the changes and what effects they've had on both software-based unlocks and hardware-based SIM interposers. In addition to comparing the most recent baseband against its own earlier hardware and software incarnations, we compare it to other current Qualcomm handsets and discuss the ramifications of changes Apple has made to the traditional Qualcomm baseband boot sequence.

Take a look below...






iPhone Dev-Team to Release 06.15 Baseband Downgrade Today



The iPhone Dev-Team will be releasing the 06.15 baseband downgrade today, according to a tweet from MuscleNerd.

Sunday should be a Funday for those waiting for 06.15 BB downgrade! ("Sunday"==PDT, i.e UTC-7). Blog will have details before release

The 06.15 baseband is an iPad baseband that many iPhone 3G and iPhone 3GS owners updated to in order to unlock their device.

Now that a downgrade method has been discovered those users will be able to get true GPS and an ultrasn0w unlock.

the 06.15 downgrade allows both true GPS location services and ultrasn0w unlock (if it's still needed) to work

(Great Job Muscle Nerd, thank you sir)