Why the iPhone 6 Plus cannot turn on? Why
it shows unknown error 9 when root it? Are you still looking for a solution?
This article can solve your troubles.
Usually, if iPhone cannot turn on, we will
try to solve the problem by rooting it first. In this case, the iPhone 6 Plus
fell, and then it didn't boot. When we use iTunes to root iPhone 6 Plus, it
reports unknown error 9. According our experience, the unknown error 9 was
caused by NAND Flash error of CPU error. We need to explore the cause of it further
and solve the problem.
First, remove NAND FLASH and use multimeter to 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.
Second, check CPU.
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 7-32.
Then we measure the diode data to ground of
the solder pad, finding that the data is infinite. Thus, we 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 7-33.
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 we can see
the jumped wires and UV Solder Resist, as
shown in picture 7-34.
After jumping wires and soldering CPU, turn
iPhone on and get into IOS, as shown in picture 7-35. The unknown error 9 is
missing, and the iPhone 6 Plus can back to normal work.
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