You could try this which was posted a couple of years ago
please download firmware here: https://drive.google.com/file/d/19GiREUz9iqxG6R68Os32goBO-me4jUN8/view?usp=sharing
And can upgrade firmware in web management page or use the tool: https://drive.google.com/file/d/1RF39agSx7TWCzf8wwBbOPOLoDIKwvnXE/view?usp=sharing