The FBI's iPhone Unlocking Tool Doesn't Work On Newer iPhones

 FBI has confirmed that the method they used to unlock the 'San Bernardino iPhone 5c' does not work with newer iPhones, including the iPhone 5s and Apple's newest generation of products
James Comey, director of the FBI said this to CNN that the third-party tool they used to access data on the iPhone 5c in question only works on a "narrow slice of phones". However, and unsurprisingly, Comey did not go into any specific details on how this tool works, or exactly what type of device it is used on.

Edward Snowden, believed that the FBI was able to hack into the iPhone 5c as it does not feature Apple's Secure Enclave. Without this security feature, auto-erase functionality can allegedly be bypassed by copying what's stored in the flash memory, brute forcing some pass code attempts, and then copying the data back to the iPhone before the attempt limit is reached to reset the counter.
This method doesn't work on newer handsets with the Secure Enclave as the login attempt counter is stored within the Enclave, which cannot simply be overwritten through a simple hack.
Though the FBI is pretty keen on not telling Apple exactly how the hack was performed, as Apple would go ahead and fix the issue, preventing the FBI from using similar hacks in the future. Luckily for Apple, though, it appears like the company's newer devices are safe from hackers and other intrusions.