Everyone needs to update their software today since there is an OTA update available to download which will alleviate the errors everyone is having. No need to hard data reset or any downgrading necessary.
VRUFNK1 does absolutely nothing to restore SD card access. So it's not a complete fix.
I just installed KOT49H.I545VRUFNK1 and it fixed the problems I've been having with KOT49H.I545VRUFNG6