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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