How to recover lost mp3 files from an app on iPhone 4S?

I have an iPhone 4s, and recently plugged it into my computer to update to the newest software. Before doing so, I backed up my phone, including a few apps for downloading and playing mp3 files. Something went wrong with the update, and i had to restore my phone. After putting the back up on my restored and updated phone, I found this apps emptied of hundreds of mp3 files. Is there any way for me to recover these files? It would really be a hassle to have to download them all again.

You can recover lost mp3 files from iPhone 4S with steps below.

Connect iPhone to computer, and then open "Computer", iPhone should show as a drive letter there. If not, please follow these instructions: In iTunes, right click on your iPhone and select "iPhone Options". Under the "iPhone" tab, make a tick in "Enable Disk Use". Click OK. Unplug your iPhone, then replug.

Now follow steps below
Step1: Download Asoftech data recovery software, then install and launch it in Windows machine correctly.
Step2: Sync your iPhone with computer. Then you should see it shows as a drive letter in 'My Computer' like H:/.
Step3: Select iPhone drive letter and then click "Next", you will find all your lost files in the lists.
Step4: After the automatic scanning, it's time to finish all the steps by clicking "Recover" easily to Recover your files!

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