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5 steps to fix iPhone 6 auto restart and shows unknown error 4005 after dropping

Sometimes, the drop of iPhone is inevitable, if you are lucky, your iPhone can continue to work properly. Conversely, the iPhone can't work. When you face the back of that situation, please don't worry, this article will help you.

Trouble Phenomenon

Then iPhone 6 fell to the ground, we pick it up and turn it on, it shows white apple and then restart, when we root it, it reports unknown error 4005. The NAND flash has been solder, and there are jumped wires at logic NAND FLASH IC , as shown in picture 7-48.



Resolution Steps

1.  Root the iPhone 6, enters the DFU mode. After it is rooted, it reboots. Then it standbys until it reports unknown error (4005). Usually, faulty NAND FLASH, CPU upper board and disconnected motherboard would cause such problems.

2.  Use multimeter to measure the diode data to ground of chip. The data is normal. After tearing the NAND FLASH, measure the diode data to ground that NAND FLASH use it to communicate with CPU. The data is normal too. Replace the NAND FLASH and root. The problem is still the same.

3.  Solder CPU again to root. The problem is still the same. Tear the NAND FLASH again and measure its diode data to ground. I find that a solder pad is pseudo soldering. Using diode pole of multimeter to measure, if I press hard, the probe will show resistance data. The pseudo soldering pins are shown in picture 7-49. In this case, we can be sure the board is faulty.



4.  Find the pins that connect CPU. and then jump a wire from CPU solder pad to the solder pad of NAND FLASH, as shown in picture 7-50 and 51.





5.  After jumping the wire, assemble CPU and put motherboard on assembly to root. It now shows progress bar, as shown in picture 7-52. When root finishes, it can get into IOS. After testing, all the functions are normal. The iPhone 6 can work normally again.

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