Many users were met various error codes when they flashing their iDevice in iTunes or 3uTools, here 3uTools summarizes some common error codes for you (some with solutions) so that users could know why the error arises and how to solve the error effectively.

3utools Firmware Check Code Error Codes

I also tried a program called 3uTools that flashes a completely new firmware and file system to the device but at around 80% it fails as well. Any help would be greatly appreciated. Answer this question I have this problem too Subscribed to new answers. So Upon further inspection I found the water damage indicator near the SIM card was red while the 2 others were white. So I am not sure whether it was the indicator that failed or not, as it is my grandfathers phone. He says he has never spilled/dropped it in water. Everything looks clean with the exception of my fingerprints on some of the parts.

Warmly Remind: Click 'Ctrl' + 'F' simultaneously, which can help you find the error code faster.

Error-1

Baseband CPU/chip/baseband output of power supply is abnormal.

(With the latest 3uTools, here is the guide for you)

Error 1

Baseband CPU problem or baseband power is not working. Here is the guide for you.

Error 2

Baseband, does not exclude power supply problem.

Error -2

You are suggested to enter DFU mode manually and try to flash again. If fail, it could be a hardware problem on your device.

Error 3

a. Baseband error when your flashing process is over 60%,

b. Chip's problem when your flashing process at 99%.

Here is the guide for you.

Error 6

Hard disk/ Chip problem when flashing process is over 60%.

Error 9

Hard disk, check power supply for it, rebooting your Mac or PC may resolve this issue.

Here is the guide for you.

Error 10

Server certification issues. Here is the guide for you.

Error 11

Firmware package is not full. Here is the guide for you.

Error 12

Firmware was closed signing. Here is the guide for you.

Error 14

Hard disk, check the resistance between hard disk and CPU. Here is the guide for you.

Error 15

Baseband, not excludes power supply problem.

Error 16

Baseband/CPU/Chip, mostly is chip problem. Here is the guide for you.

Error 17

Here is the guide for you.

Error 20

Enter DFU mode and flash again. Here is the guide for you.

Error 21 CPU/ Battery problem. Here is the guide for you.

Error 23

In software you have to set a default web browser;

In hardware, it's a communication problem. Check all connections, also try to change the battery;

Faulty baseband flash or processor;

Happens frequently after water damage. Remove and clean motherboard;

Here is the guide for you.

Error 26

Baseband/CPU/Chip. Here is the guide for you.

Error 27

Chip data does not match, please use the chip instrument to fix the chip.

Error 28

CPU or hard disk. Here is the guide for you.

Error 29

Battery problem or network problem. Here is the guide for you.

Error 31

Baseband problem.

Error 34/35/36/37

Here is the guide for you.

Error 39

Here is the guide for you.

Error -39

Error 40

Baseband, not excludes power supply problem.

Error 47

Chip problem or communicate CPU

Error 48

Baseband /Chip problem, the chip could be fixed sometimes.

Error 50

Baseband CPU breakdown.Here is the guide for you.

Error -54

Here is the guide for you.

Error 53

Touch ID fingerprint or server certification issues. Here is the guide for you.

Error 56

Baseband/CPU/Chip, mostly is NFC problem. Here is the guide for you.

Error 91

Hard disk problem.

Error 1002

Here is the guide for you.

Error 1003

Baseband or hard disk.

Error 1004

Here is the guide for you.

Error 1005

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Hard disk problem, here is the guide for you.

Error 1013

Server certification issues.

Error 1015

Downgrade firmware problem, fix your PC system and flash again

Error 1600

CPU problem.

Error 1601

CPU problem.