It’s worth noting that the program can’t work without iTunes, so you need to have iTunes installed in your computer in order to use Leawo iOS Data Recovery for Mac. But you don’t have to open it while using the program.
As mentioned before, you can recover data from iOS device directly. In actuality, there are two modes to recover data from iOS device, one is Normal mode for recovering data like Messages, Contacts, Call History, WhatsApp, Notes, Calendar, Reminders and Safari bookmark. Another is DFU mode, which can recover not only all the data that Normal mode can recover but also data types like Camera roll, Photo stream, Photo Library, Message attachments, Voice memos, and WhatsApp attachments. But DFU mode only supports iPhone 4 and iPod touch 4 for now whereas Normal mode supports all iOS devices since iPhone 3GS.
1.1 Run the iOS Recovery Software and Connect iDevice
Run Leawo iOS Data Recovery Software for Mac after installing it on MacBook, and then choose "Recover from iOS Device" entry.
Connect the iOS device to the MacBook via the USB cable. The software will detect the iDevice automatically.
Then click "Start" 
1.2 Analysis of the iOS Device and Preview of the Files
After clicking the "Start" button, an analysis of the iOS device will begin.
After the analysis, the window of preview will show up. The categories of the files in your iOS device will be shown in the left sidebar, and the ones without contents will be grey. However, you can pitch on the “Only display the deleted items” 

Then click the certain category and the contents in it will be shown in the right part of the window.
Check all the files and data you want to recover and click Recover 
1.3 Recover Selected Files and Choose Target Folder to Save
After clicking "Recover" button, the dialog of choosing target folder will pop up. Click "Open" 

The recovery will be finished in short time. During the recovery, please don’t disconnect the iOS device. After the recovery, the target will pop up. The user is able to manage the files with ease.
DFU mode supports recovering 14 types of data, 8 of them are also supported in Normal mode and 6 of them can be only found in DFU mode. The 8 types of data that both Normal mode and DFU mode support recovering are Messages, Contacts, Call History, WhatsApp, Notes, Calendar, Reminders, Safari bookmark. The 6 types of data that only DFU mode can recover are Camera Roll, Photo Stream, Photo library, Message attachments, Voice memos, WhatsApp attachments. DFU mode is currently exclusive to iPhone 4 and iPod Touch 4.
2.1 Connect the iDevice and Run the Software
Connect the iDevice (iPhone 4 or iPod touch 4) to the MacBook with the USB cable. Then launch Leawo iOS Data Recovery for Mac. The software will show a tutorial of activating DFU mode on your iOS device after detecting your iDevice. You should manually activate the DFU mode then.
2.2 Activate the DFU Mode and Scan of the iDevice
When you are ready to activate DFU mode, Click "Start" 
2.3 Select Files and Choose Folder to Save Them
Click the category and then the files of that category will be shown in the right part of the window. Check the files or the category and click "Recover" 
The dialog pops up for you to save the exported files. Click "Open" 

When the recovery is ongoing, a dialog of recovering process will show up. The progress bar will show the percentage of the recovery. Please don’t disconnect the iOS device until the recovery is done.