How to fix iPhone 6S failed to boot and unknown error -1 A customer sent us an iPhone 6S to repair, the problem is that the iPhone 6S is failed to boot and report unknown error -1. What’s going on? How to fix it? Keep reading.
Disassemble the iPhone, test iPhone 6S current by DC power supply, the current s 100mA. Connect iPhone 6S to the computer, the iPhone shows DFU mode, and won’t quit. Reflash iPhone by iTunes, it reports unknown error -1. Remove the iPhone Nand flash, test the power supply of the iPhone Nand flash, the iPhone nand flash on the left side of the capacitor can be tested to 0.9V, 1.8V, 3.0V, the power supply is normal
Remove the iPhone Nand flash to test. First, hit the resistance value, and it is normal. Test the Nand flash by using the iPhone test fixture. This 6S original Nand flash is damaged, the data can only be read but only replaced. First, query the serial number through IMEI. The professional of sn with BT WF address can find out the Bluetooth and WiFi address (referred to as the three codes). After the mobile phone is replaced, the mobile phone after win 11 must be written to the original three codes to activate after replacing the hard disk. Before writing the code, write the underlying data of the corresponding model first. If the underlying data has any problems, there will be some strange problems, which belong to the underlying error phenomenon. So you can use JC PCIE NAND test fixture to read and write. After watching the camera, the screen is reversed. Re-writing the underlying data to solve the problems
Tips: There are also some hard disks, 4.7-inch mobile hard disks on the 5.5-inch machine, incorrect underlying data can also contribute to abnormal subtitles display. This 6S boot DFU brush machine does not go, the fault is solved after replacing the hard disk Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com