Therefore, you'd better minimize the use of your iPhone and find a professional iPhone message recovery tool to get back the deleted messages that you found on your iPhone 4s/5/5s/6/6s/SE/7. Must Read: How to Transfer Text Messages from iPhone to Computer.
Part 2: How to Recover Deleted Messages on iPhone via iTunes Backup?
Since the backup file is unreadable, you have to extract it for reading and recover deleted iPhone messages from it. Once the scan stops, you can preview all the text messages in the iCloud backup file.