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Troubleshoot: iPhone 6 Plus iTunes error 4014 after Nand upgrade

For Apple users, iTunes error code are not strange, it is common to see that iTunes error 4014 or iTunes error 4013. Today, we will share a case about iPhone 6 Plus reports iTunes error 4014 after iPhone Nand Flash upgrading.


When we flash the iPhone device, it displays error 4014 before progress bar showing up. It is restored and the serial number could be recognized, which appeares after Nand expansion. This is usually caused by the iPhoneUSB chips leading to CPU problem. We get to know it UMT motherboard after disassembly, then remove USB chip U1700 to measure resistance from solder pad to CPU, we find that AP_TO_TRISTAR_ACC_UART6_TXD shows the infinite value. And AP_BI_12C0_SDA is also broken, as shown in picture 1.



The layer wire is disconnected, so we need to find out other connection point or digging for other holes, AP_TO_TRISTAR_ACC_UART6_TXD is direct connected without other external components, when digging the circuit AP_TO_TRISTAR_ACC_UART6_TXD we find that there is a hole next to socket, dig it to solder jumper wire. 



AP_BI_12C0_SDA has a test point outside of the iPhone circuit board , welding directly from the test point.


Finally,  install the iPhone USB chip back, and assemble the iPhone. Connect it to computer via Apple data cable,  flash it again, now it's smooth and successful brushing iPhone.

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