Root FS is not expanded in LuCI but

[Exio0]

@RuralRoots

I told you your method was incorrect here

i finally completed that. it was a ip/dns issue but i have luci and ssh now. i dont know what method are you meaning

dont know how but now the /boot/grub/grub.cfg file doesnt exist..
can i regenerate it somehow?

can i use this one? (changing UUID)

How to install OpenWrt as a new os in the grub menu?

menuentry "OpenWRT" { linux /boot/vmlinuz root=PARTUUID=b3ade79d-02 rootfstype=ext4 rootwait console=tty0 console=ttyS0,115200n8 noinitrd } menuentry "OpenWRT (failsafe)" { linux /boot/vmlinuz failsafe=true root=PARTUUID=b3ade79d-02 rootfstype=ext4 rootwait console=tty0 console=ttyS0,115200n8 noinitrd } the root= value will probably be incorrect, you'll need to adjust it. And you'll need to redirect the boot to sdb, since it's where you put OpenWRT.

EDIT: tried but OpenWRT is not saving that change, do i need something like update-grub?

im using PARTUUID not UUID