If your Android phone is showing you error message – “SD is blank or has unsupported file format”, then follow the below mentioned solution to fix it:
Solution 1: Reboot the Phone
First solution for fixing blank SD card error is to switch OFF and Switch ON your phone. You can also reboot the phone. Check whether your problem is fixed or not. If not then follow the second solution.
Solution 2: Format the Card
Format the SD card. Connect the SD card to your PC with the help of card reader and perform the format process. Once the format process completes, re-insert the card into phone and check problem is solved or not.