The twin prime conjecture is independent of the base, so the base doesn't matter for it to be true or false.
I would find this surprising, since in a base 2 system every prime number ending in 1 is followed by a prime number ending in 1.
In base 2, every prime ending in 0 is also followed by a prime ending in 1.
Ideally Apple will change this and allow an option to lock down recovery mode, maybe with the option of "if you forgot you pin, you can erase everything first," and refuse to load even signed software until the pin is entered or the device is erased.
My understanding is that they did change this in iPhone 5S and above models. The vulnerability only exists in this form on the 5C and regular 5 models. The terrorist's phone was specifically a 5C. The downside is if you comply with this order then it's possible to crack every single 5C out there with this method and that's a horrendous precedent to set.
To err is human, to moo bovine.