> If it turns out that the auto-erase feature is on, and the Effaceable Storage gets erased, they can remove the chip, copy the original information back in, and replace it. If they plan to do this many times, they can attach a “test socket” to the circuit board that makes it easy and fast to do this kind of chip swapping.
> If the FBI doesn't have the equipment or expertise to do this, they can hire any one of dozens of data recovery firms that specialize in information extraction from digital devices.
Presumably you'd only have to remove it once, then install it in an easily-controlled circuit that would selectively connect it back to the rest of the phone?
for passcode, iPhone supports 4-Digit numeric code (10k combinations), 6-Digit numeric code (1 million combinations), "custom numeric code" (arbitrary length, millions of combinations), or "custom alphanumeric code" (arbitrary length, millions of combinations)