No boot directory mounted, openwrt hangs on boot after resize hdd

It's so difficult to resize the hard drive in efi bootloader

my disk is as follow, I am able to get partition modified, but unable to find and modify /boot/grub/grub.cfg

OPENWRT hangs on "Waiting for root device PARTUUD="

image: openwrt-23.05.0-rc3-armsr-armv8-generic-ext4-combined.img

/boot/grub/grub.cfg missing from the instruction below
[HOWTO] Resizing root partition on x86 (November 2022 edition) - Installing and Using OpenWrt - OpenWrt Forum

The guide is for x86, so it might not work for you.
Try root=/dev/sda2 instead, if you know where to change it.

i think i found grub.cfg under /mnt/efi/openwrt

On x86 it would have been in /boot/grub (or grub2, I don't remember) on sda1.