How to fix iTunes error -1 in an iPhone 6

Select a difficulty level for this entire task (including any prerequisite instructions). The difficulty ranking reflects the experience, physical dexterity, and risk involved.

Very easy

Does not require opening device.

Easy

Requires minimal disassembly and requires only basic tools like a Phillips or flat-head screwdriver.

Moderate

Requires a fair amount of disassembly. This is a task that most people would not perform without instruction.

Difficult

Requires significant disassembly and may require specialized tasks like soldering.

Very difficult

This task is considered quite challenging, may require specialized tasks like micro-soldering, and may risk damage to the device. If you can do this, people may call you MacGyver on occasion.