Ultra+ 256GB error on first POST only

On the german forum I found a description, why the firmware update was canceled.

http://forums.sandisk.com/t5/SanDisk-UltraPlus-SSD/ULTRA-SSD-Firmware-Version-X2306RL-ver%C3%B6ffentlicht/td-p/306041

On some systems the firmware update won’t start or even fail! So there is really a risk updating.

And wtf, why is there no edit button for a post on this forum?!