Most people may meet the situation that lost all data on your USB flash drive and you can not find the right way to undelete files. Just a few days ago, I received one email from a customer:  The day before yesterday I was on a business trip with my boss in L.A. We were planning to sign a contract with an international environmental protection company and I was the one to prepare the contract that I saved in my USB flash drive. The next day I went to print the contract at a photocopy center and I was shocked when I connected the USB drive with the computer. I lost the contract! My boss was so disappointed with me and he suggested to postpone the meeting immediately, avoiding losing a great chance to cooperate with this company."
He wants to know how to save the day.
How to Undelete Files From USB Flash Drive?
1. Download OSpeedy Data Recovery and install it.
2. Activate and start OSpeedy Data Recovery.
3. Select the document from which the file you wish to recover was deleted or formatted.
4. Click "Scan". OSpeedy Data Recovery could search the files that exist in hard drive sectors that are flagged to be overwritten.
5. Choose the file you want to recover in the listing of files that OSpeedy Data Recovery finds.
6. Click "Recover" and to see if the file is available once again in its original location.  
The way to Undelete Files From USB Flash Drive by OSpeedy Data Recovery is the best.
Do you want to know more about OSpeedy Data Recovery?
1. Recover office document, photo, image, video, music, email, etc.
2. Recover from hard drive, USB drive, memory card, memory stick, camera card, Zip, floppy disk or other storage media.
3. Support FAT12, FAT16, FAT32, NTFS/NTFS5 file systems.
4. Specify file types before file recovery to find lost files quickly.
5. 600+ File Formats: Photos, videos, music, docs, emails, .zip, etc.
6. Any Data Loss Situation: Recover deleted, formatted, or otherwise inaccessible files.
7. Not Just for Hard Drives: Recover from USB sticks, external hard drives, mobile phones, digital cameras, iPod, MP3/MP4 players and more.
8. 100% safe. This Windows data recovery program works without any damage to your data.
People speak highly of it and you can have a try. Thanks for reading. Hope it helps. Best Regards.