diff --git a/main.go b/main.go
index 5207ea3..5de18a2 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"Win2Linux/pkg/windows"
 	_ "embed"
 	"fmt"
 	"os"
@@ -49,7 +50,10 @@ func onReady() {
 		mCustom := systray.AddMenuItem(key, "Switch to"+key)
 		go func() {
 			<-mCustom.ClickedCh
-			fmt.Println(uuid)
+			if uuid == "{fwbootmgr}" {
+				rebootToFirmware()
+				return
+			}
 			reboot(uuid)
 		}()
 
@@ -71,7 +75,7 @@ func list() []Entry {
 	cmd := exec.Command("bcdedit", "/enum", "firmware")
 	out, err := cmd.Output()
 	if err != nil {
-		panic(err)
+		fatal(fmt.Sprintf("failed to run bcdedit: %s\n\nRun this program in administrator mode", err), 1)
 	}
 	return parse(string(out))
 }
@@ -122,13 +126,26 @@ func parse(out string) []Entry {
 }
 
 func reboot(uuid string) {
-	if err := exec.Command("bcdedit", "/Set", "{fwbootmgr}", "BootSequence", uuid, "/addFirst").Run(); err != nil {
-		panic(err)
+	out, err := exec.Command("bcdedit", "/Set", "{fwbootmgr}", "BootSequence", uuid, "/addFirst").Output()
+	if err != nil {
+		windows.MessageBox(windows.NULL, fmt.Sprintf("failed to execute bcdedit: %s", out), "Win2Linux", windows.MB_OK)
+		return
 	}
 
-	if err := exec.Command("shutdown", "/r", "/t", "0").Run(); err != nil {
-		panic(err)
+	out, err = exec.Command("shutdown", "/r", "/t", "0").Output()
+	if err != nil {
+		windows.MessageBox(windows.NULL, fmt.Sprintf("failed to restart the computer: %s", out), "Win2Linux", windows.MB_OK)
 	}
-
-	os.Exit(0)
+}
+
+func rebootToFirmware() {
+	out, err := exec.Command("shutdown", "/r", "/fw", "/t", "0").Output()
+	if err != nil {
+		windows.MessageBox(windows.NULL, fmt.Sprintf("failed to restart the computer: %s", out), "Win2Linux", windows.MB_OK)
+	}
+}
+
+func fatal(message string, exitCode int) {
+	windows.MessageBox(windows.NULL, message, "Win2Linux", windows.MB_OK)
+	os.Exit(exitCode)
 }
diff --git a/pkg/windows/windows.go b/pkg/windows/windows.go
new file mode 100644
index 0000000..202cc3f
--- /dev/null
+++ b/pkg/windows/windows.go
@@ -0,0 +1,30 @@
+package windows
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	NULL  = 0
+	MB_OK = 0
+)
+
+// MessageBox of Win32 API.
+func MessageBox(hwnd uintptr, caption, title string, flags uint) int {
+	_caption, err := syscall.UTF16PtrFromString(caption)
+	if err != nil {
+		panic(err)
+	}
+	_title, err := syscall.UTF16PtrFromString(title)
+	if err != nil {
+		panic(err)
+	}
+	ret, _, _ := syscall.NewLazyDLL("user32.dll").NewProc("MessageBoxW").Call(
+		uintptr(hwnd),
+		uintptr(unsafe.Pointer(_caption)),
+		uintptr(unsafe.Pointer(_title)),
+		uintptr(flags))
+
+	return int(ret)
+}