Errors while updating iphone 4
Generally speaking, restarting your i Phone will solve the freezing issue and complete the i OS 10/9/8 update.
To restore your device to the latest version of i OS, use recovery mode.
If you are getting errors trying to restore in i Tunes, DFU mode is very likely for you. Recovery mode has a picture that says connect to i Tunes.
In DFU mode, the i Phone screen backlight is not even on and the display is blank. Try adjusting the 10 seconds to be slightly less like 9 seconds, then 8, then 7.
I have successfully paired my LG Revere 3 Verizon phone with my i Phone 4.
However, after clicking OK to the Pair operation, the i Phone displays LG VN170 as the paired device and "Not Connected" as status.Rei Boot and Rei Boot (Mac) enables you to fix i OS freeze, i Phone crashed during i OS 10/9 update, Recovery Mode stuck, DFU stuck, red i Tunes logo stuck, etc. Then Rei Boot will automatically detect the condition of your i Phone.