Install unyaffs by entering the following commands in the terminal:
sudo apt update sudo apt install unyaffs
Description:
Extracts files from a YAFFS2 filesystem image
Unyaffs is a program to extract files from a YAFFS2 filesystem image. Currently it can only extract images created by mkyaffs2image.
Homepage: https://github.com/ehlers/unyaffs
Version: 0.9.6-1build1
Section: universe/devel