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Troubleshoot tips for iPhone 6S Plus reports unknown error 4013

It's normal to see that the iPhone shows unknown error 4013 when boot it with iTunes, so when you come across this problem, please don't worry it, just find the reason and fix it. 

Here is an example, iPhone 6S Plus suddenly turns off when in normal use, and then we turn it on, it reboots itself after displaying white Apple logo. Use iTunes to root and it reports unknown error 4013. USB controlchip has been changed. Other parts are not fixed and it has not been dropped and gotten into water. Now, we have the solution for fixing this problem.

1. Use i4 tools to root the iPhone 6S Plus. Usually, if iPhones 6S and its later series have such problem, the NAND Flash, CPU or baseband are damaged. Use i4 assessment tools to root it and find the faulty place. When white Apple shows, the device UDID that i4 assistance reads are 0, as shown in picture 7-45. UDID exists in NAND Flash, so NAND Flash is faulty. And, the white Apple shows very quickly when rooting (the time from that i4 loads IBEC to that it gets into recovery), which suggests that CPU recognizes NAND Flash. Thus I can be sure that NAND Flash is broken.



2. Replace the NAND Flash. After replacing NAND Flash, the rooting goes on smoothly and successfully. The material object is shown in picture 7-46.



3. After activating it, we find that iPhone can connect computer, but it does not present charge. Because it has changed the USB Control chip before, the chip may be broken. Tear down a USB management chip from a iPhone 6 motherboard. Then connect it to computer and it presents normal charging process. The no charging problem is excluded. The material of U2 USB control chip is shown in picture 7-47.



TIPS:

  • The USB management chips of iPhone 5S, iPhone 6, iPhone 6 Plus, iPhone 6S and iPhone 6S Plus can be used universally.



  • We had better use heatingplatform  to preheat the NAND Flash, if we want to remove it. If it is not preheated, CPU upper board is very likely to have bumps. Although the bumps are not at the right back place, too much air between the upper and lower board will cause bumps at upper board.
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