OK had and Ultra Plus 256 for a good 5 minutes and its dead.
Updated the firmware as per the instructions and it will no longer show in the bios. I used the Sandisk Tools created a bootable flash drive. The update looked fine but the drive died.
Is this a common thing with Sandisk?
Also more annoyingly how does the firmware being displayed as xx.xx.xx relate to the firmware update of X2316RL there appears to be no reference of a version anywhere.