Problem in tp-link Archer c60 v2 default software

hi,
I have a problem with my router tp-link Archer c60 v2 I want to install the default software

Firmware Version OpenWrt 18.06.4 r7808-ef686b7292/ LuCi openwrt-18.16 branch(git-19.170.32094-4d6d8bc)
Version Kernel 4.9.184
Modelo TP-LINK ARCHER C60 V2

Iso intall: openwrt-18.06.4-ar71xx-generic-archer-c60-v2-squashfs-factory.bin

How can I install the default software?

thanks.