You can easily downgrade to iOS 8.1.2 for Apple currently still open access. However you have to be quick to do it before Apple closes signin access to iOS 8.1.2.
Download iOS 8.1.2
Download iOS 8.1.2 (4S): iPhone4,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5 GSM): iPhone5,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5 GSM+CDMA): iPhone5,2_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5c GSM): iPhone5,3_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5c GSM+CDMA): iPhone5,4_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5s GSM): iPhone6,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5s GSM+CDMA): iPhone6,2_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (6+): iPhone7,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (6): iPhone7,2_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5 GSM): iPhone5,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5 GSM+CDMA): iPhone5,2_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5c GSM): iPhone5,3_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5c GSM+CDMA): iPhone5,4_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5s GSM): iPhone6,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (5s GSM+CDMA): iPhone6,2_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (6+): iPhone7,1_8.1.2_12B440_Restore.ipsw
Download iOS 8.1.2 (6): iPhone7,2_8.1.2_12B440_Restore.ipsw
1. Download iOS 8.1.2 firmware for your iDevice wear.
2. Connect your device running iOS 8.1.3 computer
3. Launch iTunes and select the iOS device from the top right corner, to the left of the button the iTunes Store.
4. Press and hold down the Alt / Option key on a Mac or Shift key in Windows, click the option 'Check for Updates'.
IMPORTANT: downgrade from iOS 8.1.3 to iOS 8.1.2 successfully performed using this step, namn if you want to try another way by choosing Restore method, will take longer. If you use the Restore method, this method will erase all data on the device so do not forget to backup first.
5. Select the ipsw file you downloaded in step # 1.
6. iTunes will inform you that the update iOS device to iOS 8.1.2 will be carried out and will tell to Apple
7. Click on 'Update'
8. iTunes will run the process to downgrade to iOS 8.1.2
9. After the downgrade, the iOS device will restart. You will see an option 'Slide to upgrade'. Enter the passcode, and then wait until the downgrade process is complete. You will be asked to mengatifkan device.
2. Connect your device running iOS 8.1.3 computer
3. Launch iTunes and select the iOS device from the top right corner, to the left of the button the iTunes Store.
4. Press and hold down the Alt / Option key on a Mac or Shift key in Windows, click the option 'Check for Updates'.
IMPORTANT: downgrade from iOS 8.1.3 to iOS 8.1.2 successfully performed using this step, namn if you want to try another way by choosing Restore method, will take longer. If you use the Restore method, this method will erase all data on the device so do not forget to backup first.
5. Select the ipsw file you downloaded in step # 1.
6. iTunes will inform you that the update iOS device to iOS 8.1.2 will be carried out and will tell to Apple
7. Click on 'Update'
8. iTunes will run the process to downgrade to iOS 8.1.2
9. After the downgrade, the iOS device will restart. You will see an option 'Slide to upgrade'. Enter the passcode, and then wait until the downgrade process is complete. You will be asked to mengatifkan device.