Can somebody help me with this unequipping function please ?

local cando = true
local tool = script.Parent
local player = game:GetService("Players").LocalPlayer
local oGUI = script:FindFirstChild("ScreenGui")
local db = false
local reload , shoot
tool.Equipped:Connect(function(mouse)
	oGUI.Enabled = true
    local GUI = oGUI:Clone()
    GUI.Parent = player.PlayerGui
    wait(1)
    GUI.Equiping.Visible = false
    mouse.Button1Down:connect(function()
        if not db == true then
            db = true
            local ray = Ray.new(tool.Glowstone.CFrame.p, (mouse.Hit.p - tool.Glowstone.CFrame.p).unit * 400)
            local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)
            local beam = Instance.new("Part",workspace)
            beam.FormFactor = "Custom"
            beam.Material = "Ice"
            beam.BrickColor = BrickColor.new("Cyan")
            beam.CanCollide = false
            beam.Anchored = true
            beam.Transparency = 0.15
            beam.Locked = true
            local distance = (tool.Glowstone.CFrame.p - position).magnitude
            beam.Size = Vector3.new(0.3 , 0.3 , distance)
            beam.CFrame = CFrame.new(tool.Glowstone.CFrame.p, position) * CFrame.new(0,0, -distance /2)
            game:GetService("Debris"):AddItem(beam, 0.1)
            if part then
                local human = part.Parent:FindFirstChild("Humanoid")
                if not human then
                    human = part.Parent.Parent:FindFirstChild("Humanoid")
                end
                if human then
                   human:TakeDamage(3)
                   human.WalkSpeed = 1
                end
            end
           GUI.Time.Visible = true
	               wait(1)
                   GUI.Time.Text = "4"
                   wait(1)
                   GUI.Time.Text = "3"
                   wait(1)
                   GUI.Time.Text = "2"
                   wait(1)
                   GUI.Time.Text = "1"
                   wait(1)
                   GUI.Time.Visible = false
                cando = true
                db = false
tool.Unequipped:Connect(function()
	oGUI.Enabled = false
end)
             
           end
    end)
end)

For some reason , the Unequipped doesn't work