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How to Check iPhone Firmware from Packaging Box Serial Number The following methods will allow you to check the firmware even before the phone is activated. Normally iPhone firmware version is shown in iTunes after activating and on every successful connecting. The checking procedure on iPhone to determine its firmware version is also useful is you decide to buy iPhone on eBay or auctions sites. Currently, even though iOS 10 has been released, the last version which is jailbreakable is iOS 9.3.3, excluding iOS 9.3.4 and iOS 9.3.5 which are both still uncrackable. If you intend to unlock the iPhone for use with carriers other than AT&T or to install third-party native applications and don’t want to lose any call functions by downgrading an iPhone that was previously unlocked, it’s important to check and verify that the iPhone you’re getting is in fact comes with old version of firmware software, and never yet been upgraded before. However, there is possibility that some stores may still stock some inventories of iPhone in older firmware version. In future, all new iPhone models will be sold pre-installed with new and latest firmware out of the box. And it’s also cannot be hacked to unlock SIM-lock so iPhone can only be used on AT&T cellphone network in US and other Apple’s partnered carriers in other countries. So once updated, iPhone is mostly uncrackable and thus users can no longer jailbreak or install useful third-party applications or software to iPhone other than the one authorized by Apple, until somebody comes up with new jailbreak method. Most new software versions are made irreversible and unable to downgrade to once Apple no longer sign the iOS version, even though the workaround to downgrade window does exist for a brief period. In addition to bring new features and functionality to the popular iOS smartphone devices, the new update also patches various bugs and fixes various security loopholes so that hackers cannot attack the device. Apple introduces new firmware upgrade, or more commonly known as software update to iPhone, frequently.
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