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Step by step fix iPhone 6 Plus iTunes error 40

The iTunes error 40 occurred on iPhone 6 Plus after expanding,  the fault details are that after using NAVIPLUS PRO3000S programmer to expanding the iPhone 6P Nand flash,  the iPhone 6S failed to restore and reports unknown error 40,  we are going to fix step by step.



Step 1

Restore the iPhone 6 Plus again. Connect iPhone 6P to the computer with iPhone lightning cable, and then use iTunes to restore, after a while, the iTunes reports unknown error 40 and failed to restore.

Step 2

Disassemble the iPhone 6P. Use 3D Precision screwdriver to remove the screws next to the iPhone lightning port, and then put iPhone 6P on the CPB screen separator, after a while, open the iPhone display assembly, and then take out the iPhone motherboard.

Step 3

Measure the iPhone Nand flash. Because the iPhone Nand flash has been replaced, so now we need to remove the iPhone Nand flash, and then use digital multimeter to measure the resistance value of the bottom pin. After measurement, we found that the 6 pieces pins are no resistance value, the normal value should be more than 500.

Step 4

Check iPhone 6 Plus schematic diagram. Open ZXW dongle to check the iPhone schematic diagram, we know that these 6 pins are connected to the iPhone CPU directly.

Step 5

Measure the iPhone motherboard. Use a clip to fix the iPhone CPU, and then use digital multimeter to measure the resistance value of the iPhone Nand flash bottom pin, but there is still no resistance value, which means the layer board is disconnected.

Step 6

Repair the iPhone motherboard. Remove the SIM card tray, and start to use BGA blade to graver the layer board, and then measure the bottom pin again, now those pins all have value.

Put iPhone motherboard under the microscope, and then use QUICK 861DW hot air rework station to solder a jumper wire on it, and then apply some green UV oil to fix it. Now use digital multimeter to measure the resistance value, the data tested is back to normal value.

Step 7

Install the iPhone Nand flash. Attach iPhone Nand flash to the MJ 3D BGA reballing stencil, apply some solder paste to it, and then re-weld it, and then install the iPhone Nand flash to the iPhone motherboard.

Step 8

Test the iPhone 6P again. Connect iPhone to the computer, and use iTunes to restore it to test, the restore process is going successfully, no unknown error appears.

Now we can install the SIM card tray, assemble the iPhone 6 Plus. After using it for several days, all functions are working well.

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