Problem Description:

As to the iOS firmware versions below iOS7.0, it’s not required to care about Apple’s closing the firmware signing; you can still “backup SHSH from device” even though the Apple has stopped the firmware signing. 3uTools for iOS Users has 17,170 members.
Download 3utools. Open 3utools and connect your i-device via USB cable. 3uTools is a tool for flashing and jailbreaking Apple’s iPhone, iPad, iPod touch, provides two ways, Easy Mode or Professional Mode, to flash Apple mobile devices, selects the appropriate firmware automatically and supports a rapid downloading speed.

This error is typically caused by attempts to downgrade the iPhone, iPad, or iPod touch’s software. This can occur when you attempt to restore using an older .ipsw file. Downgrading to a previous version is not supported. To resolve this issue, attempt to restore with the latest iPhone, iPad, or iPod touch software available from Apple. This error can also occur when an unauthorized modification of the iOS has occurred and you are now trying to restore to an authorized, default state. Very rarely this error is caused by a hardware issue and requires service.

Here is the 100% TESTED SOLUTION. ERROR: Unable to restore iDevice(-1). 3uTools software is a tool to help you manage files, support applications, wallpapers, ringtones, flash and even jailbreak for iOS operating system on iPhone. Ipa files ) into our iOS devices. 1 – Automatic Key and Scale Detection Auto-Tune Access v9.

Solutions:

Step1: Set your iDevice into DFU mode.

Hold Home button and Power button simultaneously for 10 seconds till the screen becomes black, and then release Power button.
Continue pressing Home button for fifteen seconds. You’ve successfully set iDevice into DFU mode if you can see an iTunes logo on iDevice’s screen.

Click to enter DFU mode and Recovery Mode

Step2：Launch 3uTools. After connecting iDevice to PC using the USB cable, 3uTools can check this iDevice in DFU mode automatically.

You’re suggested to back up this iDevice using 3uTools first. Choose an available firmware and click Go Flash to restore your iPhone.

Then please keep a good network connection between iDevice and PC, and then wait until this process is completed.

You could check here for moreerror codes roundup in 3uTools/iTunes.

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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.

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%.

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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.

If this is thecase, you must not insertanother operator's SIMcard into the mobilewithout an unlatching code(this is not your PIN code).Our Customer Care teamcan provide you with anunlatching code. This is what it says on the Tesco website-Using another net

3utools Firmware Check Code Error