Installation of e4200v1

I only find a ..squashfs.bin file for my device. How do i do a factory install then?
tks, db

This might be helping: https://forum.openwrt.org/viewtopic.php?pid=290209

Hello, i rode the subject trought the link, but i don't understand what it mean.

Should i use a squashfs.bin as a factory.bin ??

I have a Archer C5 AC1200 v2 by the way.

Thanks