How do I change an assetID in a script?

	game.Players.PlayerAdded:connect(function(player) 
	player.CharacterAdded:connect(function(character)
	wait(1)
	for i, v in pairs(character:GetChildren()) do
            if v:IsA("Decal") then
			local asset = v.Head.Decal.Texture
			
			local assetId = tonumber(asset:match("%d+"))
			end
		end
	end)
end)

This is all I have of the script right now, what it's going to do is take the player's face and change it to rbxassetid://290788806, or the old :> face on Roblox.

I don't know how to change an ID through a script, and if any of you could help me that would be very nice and very much appreciated.