B1300 and 18.06.0-rc2 will it work OK?

I was looking to upgrade a new B1300 to 18.06 and using the releases/18.06.0-rc2/targets/ipq40xx/generic/glinet_gl-b1300-squashfs-sysupgrade.bin file
luci is telling me the uploaded image does not contain a supported format.

Have any b1300 users done this upgrade already?

For b1300, if you want to upgrade to openwrt firmware, upgrade from uboot is recommended.