iPhone 6 Plus boot problem and occurs unknown error(9)

When you try to turn on your iPhone 6 Plus, you might come across this situation that iPhone 6 Plus cannot be turned on and it reports unknown error (9) when rooting. Maybe you think your iPhone is waste and you had to give up. But now vipfix can help you to fix your iPhone 6 Plus make it recover well.

Trouble Phenomenon:

It cannot be turned on and it reports unknown error (9) when rooting. Customer said that: It has been dropped and cannot be turned on after using for few days.

Fix Process:

1. After receiving the iPhone and communicating with customer, there is no important information and activation lock. Then I root it.

2. Use iTunes or i4 assistance to root and it reports unknown error (9), as shown in picture 1-1.

3. Judging from my experience, NAND FLASH or CPU problems could cause the error (9).

4. First remove NAND FLASH and measure the diode data to ground, finding them normal. I suppose that the NAND FLASH itself is damaged. After I replacing a new one, the problem remains the same, so NAND FLASH is excluded.

5. Next I check CPU. Customer said that it has been dropped. As for dropped iPhone 6 or iPhone 6 Plus, the solder pad that CPU uses it to connect logic eeprom chip is easy to drop joints. Remove logic chip to measure the diode data. The location of logic chip is shown in picture 1-2.

6. Then I measure the diode data to ground of the solder pad, finding that the data is infinite. Thus, I can be sure that CPU is pseudo soldering. After removing CPU, I find that the some of CPU pins connected with logic chip are gone, as shown in picture 1-3.

7. After fixing the upper and lower board of CPU, jump two wires from solder pad to logic board. The picture of soldered CPU is not clear, but I can see the jumped wires and UV Solder Resist, as shown in picture 1-4.

8. After jumping wires and soldering CPU, turn iPhone on and get into IOS, as shown in picture 1-5. I have to explain specially that the screen of picture 1-5 is the testing screen that we use during repair process. It is a little blurred, which has nothing to do with motherboard.