Get solution for iPhone 7 iTunes error 4013 (baseband CPU issue)

The iTunes reports unknown error 4013 on iPhone 7, after checking, we need to fix iPhone baseband CPU  parts. 

Before we are going to fix it, we will prepare some tools:

1. phone opening tools

2. digital multimeter

3. tweezers

4. hot air rework station

5. solder paste

6. High Temperature Resistant Tape

Now, start to repair.


Frist, disassemble the iPhone by phone opening tools, remove iPhone logic board.

Second, use Fluke 15B+ Digital Multimeter to measure if the capacitance is short circuit to the ground? If yes, it can basically exclude and reboot, but the short circuit of the baseband CPU fault is 45%, the power failure is 45%, and the other 10% possibility is short circuit. Most of them are easy to fix except for the iPhone 7 CPU short circuit.

Third, if there is no short circuit parts, change the power supply and try to restore system again.

Fourth, if the above solutions are not effective, basically it means the baseband CPU has problem, you need to reweld baseband CPU. This is the baseband CPU pserdo soldering problem. Remove it with QUICK 861DW hot air station and reweld again. The baseband CPU of iPhone 7 is close to the main CPU. When it is removed, it should pay attention to protect with heat insulation tape, so that CPU can be flameproof.

Fifth, clean sollder pad and install the baseband CPU.

Finally, test the iPhone, now the iPhone 7 can be flashed smoothly, the iTunes error 4013 has been repaird.