My itouch4 recovery failed, and no device was detected on iTunes, and the screen only showed a conne

All you need to do is jailbreak.

Then delete iTunes and reinstall it.

Press the home button and the power button at the same time. Hold on for a few more seconds. Try it.

I've used the 91 mobile phone assistant

Don't recover, resume the game and you'll be gone. Use 91? Use 91 to delete the iTunes Control folder located in the var mobile media directory, and then connect iTunes, iTunes will let you re-register your pod, and you can re-play songs in iTunes, movies or something

You try, first press and hold the power button for 3 seconds, then press and hold the home button for 10 seconds (don't let go of the power button), after these 10 seconds, release the power button, don't let go of home, press and hold for 15 seconds, you can enter DFU mode. If unsuccessful, try a few more times.

Then press Shift+Restore in iTunes, select the firmware that has been installed, and restore it......

The latest version of iTunes has added a shield**, so after installation, some non-official Apple software may not be able to connect to the cracked iPhone and iPod

support bin.

So we just need to replace this file with the old version and continue to connect.

Pay attention to the backup file before replacing. If the file can't be replaced, it means that the iTunes background service is still running, and you can solve the problem by closing the task manager and the process in the image below.

Method 2: This method is also a method of replacing DLL files, but it is a reverse reverse.

We replace the new version in iTunes with the software installation directory you want to connect to the iPhone to replace the old version, such as replacing the old version file in Winsc, and then you can connect again.

Here is the old file, replace it with a new one, and it's OK.

If the device is not displayed, there may be a connection problem.

Reinstall iTunes after uninstalling it cleanly.