How i can use Vless protocol in my router Flint 2

Hello people, the problem is that I can't install Vless or Xray on my FLint 2. It says that the router firmware is OpenWRT, but I can't install VLeSS or V2XRAY. Please help.

Are you using the original firmware from your Flint 2?
Because the original one in OpenWRT based, not pure OpenWRT.

You can flash the pure OpenWRT if you want to.