Install Open wrt on EchoLife HG8245H GPON router

Is it possible to install Openwrt on EchoLife HG8245H GPON router? I am a newbie and I would like to know if it is possible and if you could help me with the steps to do it

Could you also tell me which version of openwrt and where I can download it?

That device isn't supported by OpenWrt. See Is HG8245H supported by OpenWrt?, same situation as then.