The 2316 firmware was only available for a short time, because some users had problems updating and destroyed their drives.
But it seems, that sandisk released a post to manually update your ssd.
Although it says 2306 in title, the links itself are called 2316. So I think you could give it a try.
Good luck!
And please save your important data before updating!
Hear’s a post of the sandisk admin on forum:
"Notice for users that Previously upgraded to Firmware Version X2316RL
Some systems have a compatibility issue with the USB or CD-ROM bootable system image and the FFU does not start or fails during the FW update process. There are no issues with the firmware and if you previously upgraded successfully you will not be affected by this issue. While we investigate this matter, we have decided to remove the new firmware from the SSD Toolkit"
So the problem is not fixed, as it seems.
