[BPI-R3] Cannot resize eMMC

Hello, I’m trying to resize eMMC overlay(?)fs.

parted /dev/mmcblk0 -- mkpart f2fs 768MiB -34s resizepart 5 768MiB resizepart 4 67.1M resizepart 3 12.6M 
reboot
mount /dev/mmcblk0p66 /mnt && umount /dev/mmcblk0p66 && resize.f2fs /dev/mmcblk0p66

However, no luck:

Plz help.