You’ve just updated to iOS 6.1.3 and spent countless hours online to find a solution to downgrade your iPhone baseband but to no avail. Stop wasting time – it’s not possible.
If you found this blog by accident it’s very likely that you’ve been trying to find a solution on how to downgrade your iPhone 4′s modem firmware which has been updated to 4.12.05. Your ultimate aim is, of course, to unlock your iPhone 4 which is already on version 4.12.05. It’s a frustrating experience because you tried various online tutorials and read contradicting reports or blogs on how to downgrade your iPhone 4 baseband but none of them had helped you address this problem.
As I’ve mentioned earlier in this article, downgrading iPhone 4 baseband 4.12.05 to a lower version is not possible, and probably will never be. Apple, Inc., well known for their “superb ecosystem” of devices, patched the exploits since the iPhone 4 was first introduced. The main purpose of this is for “security”, but I believe it’s more for supporting their partner carriers so that people who are on one carrier can’t easily switch carriers. Each time there’s a software update, Apple will do anything they can do patch any potential exploit that will allow unlocking or downgrading of iPhone’s baseband.
The first unlock available for iPhone 4 was a few months after it was first released in June 2010. I still remember back then when iOS 4 was launched together with this product, hackers were busy trying to find exploits for jailbreaking the iOS 4. The first modem firmware that comes with iOS 4 was baseband 1.59.00. When the untethered jailbreak was made available, hackers were able to hack that baseband and it was unlocked with ultrasn0w. Sadly, that was the only baseband that was exploitable and can be unlocked. Hackers have been putting high hopes to iPhone 4 users saying that the newer baseband can be unlocked or downgraded. That didn’t happen.
Three years later, iPhones baseband still can’t be unlocked using software method. Now, notice that I mentioned software method here. This is because it was still possible to unlock the iPhone 4 using a small third party device called Gevey SIM. If you bought a used iPhone from someone else, you may notice in the SIM tray that there’s a SIM card like device with a small microchip on it. This was an interesting piece of device that was able to unlock baseband 2.10.04, 3.10.01 and 4.10.01.
However, there was one tiny exception. Early least year a glitch with Apple’s activation servers around the world allowed any iPhone to be unlocked using a jailbreak app called SAM Preferences. This exploit was found by a young Chinese hacker here in Beijing. Apple was quick to address this issue by patching all their activation servers around the world.
Today, there’s still no method available to downgrade your iPhone 4 baseband 4.12.05 to a lower version. You can save your time from searching more on Google because you can’t find a solution or worst, you might be scammed by this company who claims that they can downgrade your baseband. Maybe you should consider getting your iPhone officially unlocked instead, which is by far the most superior (and only) solution available to unlock iPhone 4 baseband 4.12.05.