Why did they upgrade firmware in the first place?
Was there a serious flaw this was fixing? Or was it just a bunch of idiots who upgraded because something newer became available, or it promised 0.2% more performance? And yes, they are idiots if they upgraded the firmware on a drive (SSD or spinning) that wasn't mirrored, RAIDed or backed up!
NEVER be an early adopter patching storage devices. NEVER. Let fools walk that plank before you, and upgrade only after it has been out a while without being recalled.