Quartz, writing about a black box you connect to a cracked open iPhone:
The hacking equipment is called IP Box, and can be found on eBay for about $200. It’s a black box that connects to an iPhone and systematically runs through every possible PIN combination to unlock it.
Can this be used to break into the San Bernardino iPhone 5c? It is running iOS 8.1.2. Jury still out on whether this technique will work on that particular version of iOS. Fascinating stuff.