exfat /UHS-I microsd on hongmi

Jan 4, 2014
Hey all!
I have an UHS-I microsd. From wikipedia it is designed to work with exfat fs. And it really is INSANELY fast when formatted in exfat.
But when I plug it into the phone I get a damaged media or smth error -- i.e. the phone doesn't recognize the card.
Tried the same card with FAT32 - the speed is only upto 5MB/sec, works with the phone.
Could anyone clarify if the UHS/exfat card could work on the phone.