ext4 usb

Hello all, I encountered the "unsupported features" error while trying to mount an EXT4 partitioned USB 3.0 drive on my RT- AC68P with Merlin V384.4_2 installed. The drive was formatted in Raspbian as ext4 with the mkfs.ext4 command, with a GPT partition table. Sector size is 4096. Fdisk -l...