Are you ejecting the drive or just disconnecting it? The drive has to be ejected for the FW update to initiate.
https://kb.sandisk.com/app/answers/detail/a_id/17556
- Turn the Wireless Stick off
- Connect the Wireless Stick to a computer via USB
- Drag the update file onto the Drive. Make sure to put it in the root or main directory and not in a sub folder.
4. Right Click the removable disk and select Eject.
On a Windows Computer, go to My Computer, right-click on the Wireless Stick, then choose Eject.
On a Mac computer, find the Wireless Stick on your desktop and right-click on it, then choose Eject.