Mount and edit system.img from WSL

i'm trying to edit android system.imgi'v succesfully extract it from super.img using lpunpackthe problem is i can't mount read & write

if i mount readonly it succes :

sudo mount -o loop -r system.img system/

If i mount it read and write if gave me error :

$sudo mount -o loop,rw system.img system/mount: /mnt/f/otatools/bin/joy/system: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.

I've tried to edit fstab, but i cant find it anywhere

$ more /etc/fstabmore: stat of /etc/fstab failed: No such file or directory

thanks i advanced