First, you should make sure that you have followed the on-screen instructions to put your device into USB debugging mode (General). If that fails, try to enable USB debugging mode according to your device brand, or contact us to solve this problem!
It depends on the number of the data. Generally, RecoverGo (WhatsApp) will help you scan through your data in a few minutes.
Please try to close the program and launch it again. You can also change an USB cable to connect your device. If still fails, please contact us.
Yes, you can use RecoverGo (WhatsApp) to recover WhatsApp data from iTunes backup. Next version, RecoverGo (WhatsApp) will also support recover deleted WhatsApp data from Google Drive.