To recover your deleted or formatted files, you need download Sandisk data recovery software. Here’s a good data recovery service you may use: Sandisk device data recovery
How to recover files from Sandisk memory cards and flash drives
If your Sandisk memory card or flash drive is still functional, you can try using a data recovery program. There is a high probability that your data can be recovered after you get an error while using the card, accidentally format it or delete files.
SanDisk recommends using Asoftech data recovery. You can download a demo version of data recovery software for free. These demo versions will show you what files can be recovered and provide a preview of the files for some common picture file types. The demo versions will require purchase of a license key to enable the feature to save the files. This is an excellent way to see if the program will work before you purchase. Just follow this simple step by step Sandisk data recovery guide:
Take note that you better stop using the Sandisk microSD memory card, sd memory card, CF card, usb flash drive before you get back all your lost files.