Why iPhone 7P keep restarting and get iTunes error 9? – Fixed!

It's common that the iPhone get iTunes error and won't turn on, we have an iPhone 7 Plus comes with these problems. The iPhone 7 Plus keep restarting, and it has unknown error 9 when we reflash it with iTunes. Why is that? How to fix it? Keep reading.

Actually, there are many reasons can cause this problem, but the most frequent is the iPhone Nand flash and the iPhone logic baseband epprom IC.

Measuring the power supply of the iPhone Nand flash by digital multimeter, the 3V, 1.8V and 0.9V all are normal.

After observation, we know that the iPhone Nand flash and iPhone logic epprom IC didn't been repaired, but the iPhone baseband part did.

Now we try to fix it by replacing iPhone Nand flash, after replacement, it still reports unknown error 9, then it may problem of the iPhone logic epprom IC. Directly replace the iPhone logic epprom IC, after replacement, it still reports unknown error 9.

Because the iPhone Nand flash and iPhone baseband logic epprom IC are normal, there is another case, the resistance value of the two resistors that connected to the logic epprom IC is too large, it will also reports error 9.

Rry to replace these 2 resistors, remove the iPhone logic epprom IC and the resistors that connected to it, and then with the help of the QUICK 861DW hot air rework station and Titanium Alloy Tweezers, we replace all of them.

Now, assemble the iPhone and test it, now the iPhone 7 Plus is turning on smoothly.

After entering the IOS system, test the function on iPhone, all functions works good. The repairs end!