This issue has come up quite often. There is only two solutions:
1. Format with Fuji SM camera. Olympus cameras only do a partial format and don't restore the CIS block. This is to copy protect their panorama feature but it detracts from the quality of their cameras. You will lose your panorama feature on Olympus cards.
2. SMPrep with a reader that supports this. Eg Sandisk SDDR-09 (not newer models like SDDR-75), Dazzle or Zio SM readers. If it is an Olympus card you will lose the panorama feature but this can be restored by a hexedit of SMPrep.exe.