I'll update din my firmware tonight and try again.
I think yung beta firmware pa lang ata yung sakin...
This I got from OPPO email regarding 3TB HDD:
As long as you are using the latest Official 50-0422 or later Firmware the player will support up to 16TB drives formatted using exFAT and NTFS.
Now I can definitely buy 3 or 4 TB HDDs for my ProBox..