you need rely on professional file recovery tool to get them back. A popular one is asoftech data recovery. This tool can deep scan the memory card and recover your lost files back without requiring extra skills. Here is the steps might be helpful to you:
1. Connect camera memory card to computer. Under "My Computer", note the drive letter assigned to your memory card (usually G: or H:). If not, you need to take out your memory card and connect using a card reader, or plug-in to card reader slot if there's any on your computer.
2. Download asoftech data recovery program on your compute. here is the link:
http://www.asoftech.com/adr/3. Install and start the program, select the drive where your lost files located, click 'Next'. Now the scanning process will start to search the deleted files. After a while you will then get a list of recoverable files.
5. Press Recover to perform full recovery.
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