As we all know that the FBI paid a million dollars to unlock the iPhone of a terrorist.
as the FBI could have Hacked iPhone in just $100, instead of spending $1.3 million.
Yes, sounds crazy, but, its actually true.

According to the security researcher, Sergei Skorobogatov used the hack without the use of any expensive equipment.
He used cheap parts instead of expensive parts, that he purchased at a local electronics store.
Hacking a four-digit PIN would be the technique that can take up to 20 hours.

To do this, the researcher Sergei Skorobogatov uses a technique known as Nand mirroring technique.
Here is what the security researcher said, It does not require any expensive and sophisticated equipment.
All needed parts are low cost and were obtained from local electronics distributors.

So, this is the first public illustration of the real hardware Nand mirroring process for iPhone 5C.
However, till now both the FBI and Apple have not commented on Skorobogatovs research.