Mac users often face a situation when the get the error could not validate source – device not configured. You may have created a backup of your own or using the the time machine to restore the Mac drive when any data is lost from it or when the whole drive has been formatted. The time machine also uses an external drive where all the backup data is stored, so when you prepare the backup and start it, the data is retrieved from the external drive. So if there is any error you can encounter could not validate source – device not configured you will not be able to recover the data from that device. To Resolve this you can try to restart the system and make all the settings default. If you are unable to fix could not validate source – device not configured then you can use the provided Mac data recovery software. It is the most effective solution for the all types of Mac files, it performs a deep scan of the Mac drive and show the results in the preview window. You can select the files of your choice and then they will be restore. So download the software for complete recovery of Mac files.