Skorobogatov used a technique called NAND mirroring to bypass the passcode-retry limit set by Apple on iPhone 5c.
Skorobogatov demonstrated the iPhone 5c hack using store-bought equipment for just $100.
It doesnt work, FBI Director James Comey said back in March.
Skorobogatovs paper, published on Thursday, provides a working prototype on how to pull off the hack.
source: www.techworm.net