A while ago I was trying to get factory reset to work on my X86
From the wiki
https://openwrt.org/docs/guide-user/ins ... penwrt_x86
combined-ext4.img.gz This disk image uses a single read-write ext4 partition with no read-only squashfs root filesystem, which allows to enlarge the partition. Features like Failsafe Mode or Factory Reset won't be available as they need a read-only squashfs partition to function.