The latest version of iOS launched by Apple is the 5.1 version and ever since its launch, unlockers are desperately searching for unlock iPhone 5.1. If you have unlocked iPhone previously, then you know that unlocking iPhone relieves your phone from carrier contract. The ability to use a local SIM card in any country is so liberating and you will never want to go back to carrier locked iPhone. Many iPhone users use their iPhone as a simple iPod Touch mainly because they didn’t pay attention to the firmware and baseband limitations of free unlocking solution. If you are a jailbreaker or unlocker, you have to wait before you unlock iPhone 3G because you should not upgrade firmware version or baseband version without knowing whether supported jailbreak or unlock is available.
Why is unlock iPhone 5.1 necessary?
Once you unlock the iPhone, you will never want to let go of the unlock and so, upgrading firmware will not always be your first choice. However, you need to understand that free methods to unlock iPhone 4 are heavily limited in terms of firmware and baseband. This means that you can’t unlock iPhone 3G unless your iPhone is on a supported firmware version and baseband. This can be a terrible news, especially if you are interested in latest iOS 5.1 operating system.
Many iPhone users who have desperately waited for a reliable free unlock daringly upgraded to iOS 5.1 mainly to experience the new features offered by the latest iOS operating system version. Some users have upgraded their iPhone to 5.1 without realizing the consequences. If you purchase a brand new iPhone 4, it may be loaded with iOS 5.1. Whatever may be the reason, if you want to upgrade iOS to 5.1 or use 5.1 on an unlocked iPhone, then you need to know how to unlock iPhone 4 on 5.1.
It is always recommended by experts that you don’t attempt to upgrade your iPhone using iTunes directly if you are using jailbroken or unlocked iPhone. You can’t really do anything wrong with a brand new iPhone, but the best thing you can do is staying away from iTunes automatic upgrade which can result in firmware and baseband upgrade.
Free method to unlock iPhone 5.1 on limited basebands
Ultrasn0w is the most popular free method to unlock iPhone 5.1, but currently, newer version of Ultrasn0w is not available for 5.1. However, you don’t have to worry as Ultrasn0w Fixer is available to help you to unlock iPhone 3G on 5.1. This is merely a patch that will help you to port Ultrasn0w unlock on 5.1. The steps to unlock iPhone 4 on 5.1 are a bit sketchy at best for now and so, experts don’t recommend this method for newbie jailbreakers and unlockers. Ultrasn0w supports only a limited number of basebands and so, before trying to use the Ultrasn0w Fixer, check to ensure that your iPhone runs on supported firmware and baseband.
- Don’t upgrade to iOS 5.1 directly through iTunes. Though upgrading to iOS 5.1 is the first step to unlock iPhone 4 on 5.1, you shouldn’t do it through iTunes. If your iPhone is unlocked already using Ultrasn0w, remove the unlocker before proceeding further.
- Use Redsn0w or Sn0wbreeze to build custom ipsw firmware file through the Extras option.
- Put your iPhone in DFU mode and launch iTunes. Click on Restore button and point to the custom built ipsw firmware to upgrade to iOS 5.1 without upgrading baseband.
- Jailbreak in baseband preservation mode using the jailbreak tool.
- Launch Cydia on iPhone.
- Add http://repo.iparelhos.com repo to Cydia sources.
- Find Ultrasn0w Fixer utility and install it.
- Proceed to add Ultrasn0w repo to Cydia sources.
- Search for Ultrasn0w and install it.
- Reboot iPhone in tethered mode using Redsn0w or Sn0wbreeze and ensure that iPhone is unlocked.
How to unlock iPhone 5.1 without worrying about baseband or firmware upgrade?
Free unlocking methods for unlocking iPhone are great to use, but as long as you know what you are doing, it can be beneficial for you. For newbies, the idea of custom building firmware before jailbreak and unlock is so overwhelming. If you commit a mistake during the free jailbreak and unlock iPhone 4, you have to restart all over again and sometimes, your iPhone may be stuck in recovery or DFU mode. Moreover, free unlock iPhone 3G methods can’t help you if you have upgraded baseband.
Experts suggest that you use reliable software based jailbreak and unlock if you don’t want to risk your iPhone. After testing several unlock and jailbreak providers, we have identified computer based software to unlock iPhone 5.1 using which you can jailbreak and unlock your iPhone in a few minutes without having to worry about firmware or baseband support. How to unlock iPhone – click here!



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