Here's a forum post on overclock3d.net:
18-05-15, 11:47 AM
Today Asus have announced updates for a lot of their motherboards, this update is mainly for the new Intel NVME drives that have been released lately. The update should enable your motherboard to make the most out of these drives, especially with the new M.2 to SAS connectors that are used (in the 2½ inch drives), and have streamlined the PCI-E code within to take full advantage of the drives features for both the PCI-E and 2½ inch drives.
Below is a rather long list of motherboards that the new BIOS updates are being released for, but don't expect to immediately be able to download this update, as they will need time to get them out.
Q87M-E 1502
Maybe it only applies to M.2 SATA?