According our experience, after the iPhone drop into ground, and then it reports iTunes error 9 and 56 when we root it. Most of this case is caused by disconnection from CPU to logic IC and NFC IC. The main CPU chip and PCB board has the bad connect after iPhone dropped, so the iPhone will shows situation of not boot or iTunes error code .
The iPhone 6 reports iTunes error 9, disassemble the iPhone by repair toolkit, and check the line from logic epprom IC to CPU, there is a test point with false
soldering. Soldering jump wire directly from CPU to logic epprom IC. As shown in picture 1.
Scraping
the CPU off slowly and find the signal point to solder jump wire. As shown in picture 2.
Soldering
jumper on the position where the chip are
connected, and the iPhone can be directly switched into the system after the
connection is made up. After the customer go back for a few days, the device
reported error 56 again, error 56 is caused by the broken wire from NFC to CPU
or damaged NFC chip, firstly we remove the NFC chip. As shown in picture 3.
NFC
chip is diconnected and most of solder points are dropped, it's all blank for
the places without wire end, so soldering the useful two points with solder iron. As shown in picture 4.
Reload the chip, and then root it again, the iPhone 6 can work normally.
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