diff --git a/firmwares/NINA/FirmwareUpdater.nano_33_iot.ino.bin b/firmwares/NINA/FirmwareUpdater.nano_33_iot.ino.bin
new file mode 100755
index 00000000..b3a01ef7
Binary files /dev/null and b/firmwares/NINA/FirmwareUpdater.nano_33_iot.ino.bin differ
diff --git a/modules/nina/flasher.go b/modules/nina/flasher.go
index c1c4a904..8d85dc07 100644
--- a/modules/nina/flasher.go
+++ b/modules/nina/flasher.go
@@ -249,18 +249,11 @@ func (flasher *Flasher) Md5sum(data []byte) error {
 }
 
 func OpenFlasher(portName string) (*Flasher, error) {
-
 	port, err := utils.OpenSerial(portName)
-
 	if err != nil {
 		return nil, &FlasherError{err: "Error opening serial port. " + err.Error()}
 	}
 
-	flasher := &Flasher{
-		port: port,
-	}
-
 	time.Sleep(2 * time.Second)
-
-	return flasher, err
+	return &Flasher{port: port}, err
 }
diff --git a/utils/flasher.go b/utils/flasher.go
index b02e34f8..c109df17 100644
--- a/utils/flasher.go
+++ b/utils/flasher.go
@@ -17,13 +17,12 @@ var baudRates = []int{
 }
 
 func OpenSerial(portName string) (serial.Port, error) {
-	var err error
+	var lastError error
+
 	for _, baudRate := range baudRates {
-		mode := &serial.Mode{
-			BaudRate: baudRate,
-		}
-		port, err := serial.Open(portName, mode)
+		port, err := serial.Open(portName, &serial.Mode{BaudRate: baudRate})
 		if err != nil {
+			lastError = err
 			// try another baudrate
 			continue
 		}
@@ -33,8 +32,9 @@ func OpenSerial(portName string) (serial.Port, error) {
 			log.Fatalf("Could not set timeout on serial port: %s", err)
 			return nil, err
 		}
+
 		return port, nil
 	}
 
-	return nil, err
+	return nil, lastError
 }
diff --git a/utils/utils.go b/utils/utils.go
index e37572dd..d32cc465 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -40,10 +40,10 @@ func GetCompatibleWith(name string) map[string][]firmware {
 
 	knownBoards := make(map[string]combo)
 	knownBoards["mkr1000"] = combo{match: "(WINC1500)*(3a0)", loader: "WINC1500/Firmware*"}
-	knownBoards["mkrwifi1010"] = combo{match: "(NINA)", loader: "NINA/Firmware*(mkrwifi)*", avoid: "uno"}
-	knownBoards["nano_33_iot"] = combo{match: "(NINA)", loader: "NINA/Firmware*(mkrwifi)*", avoid: "uno"}
-	knownBoards["mkrvidor4000"] = combo{match: "(NINA)", loader: "NINA/Firmware*(mkrvidor)*", avoid: "uno"}
-	knownBoards["uno2018"] = combo{match: "(NINA)", loader: "NINA/Firmware*(unowifi)*", prefer: "uno", avoid: "mkr"}
+	knownBoards["mkrwifi1010"] = combo{match: "(NINA)", loader: "NINA/Firmware.*mkrwifi1010.*", avoid: "uno"}
+	knownBoards["nano_33_iot"] = combo{match: "(NINA)", loader: "NINA/Firmware.*nano_33_iot.*", avoid: "uno"}
+	knownBoards["mkrvidor4000"] = combo{match: "(NINA)", loader: "NINA/Firmware.*mkrvidor.*", avoid: "uno"}
+	knownBoards["uno2018"] = combo{match: "(NINA)", loader: "NINA/Firmware.*unowifi.*", prefer: "uno", avoid: "mkr"}
 	knownBoards["mkrnb1500"] = combo{match: "SARA", loader: "SARA/SerialSARAPassthrough*"}
 
 	listAll := false
@@ -55,25 +55,28 @@ func GetCompatibleWith(name string) map[string][]firmware {
 	exePath, _ := os.Executable()
 	root := filepath.Dir(exePath)
 	root = filepath.Join(root, "firmwares")
+	loader := regexp.MustCompile(knownBoards[name].loader)
+	fw := regexp.MustCompile(knownBoards[name].match)
 
 	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			return nil
+		}
 		unixPath := filepath.ToSlash(path)
 		parts := strings.Split(unixPath, "/")
 		fancyName := parts[len(parts)-3] + " " + parts[len(parts)-2]
-		loader := regexp.MustCompile(knownBoards[name].loader)
-		fw := regexp.MustCompile(knownBoards[name].match)
 		f := firmware{
 			Path:     path,
 			Name:     fancyName,
 			IsLoader: loader.MatchString(path) && !listAll,
 		}
-		if info.IsDir() {
-			return nil
-		}
 		folder := filepath.Dir(path)
 		lowerPath, _ := filepath.Rel(root, path)
 		lowerPath = strings.ToLower(lowerPath)
 		_, alreadyPopulated := files[folder]
+		if strings.HasPrefix(f.Name, "firmwares") && !f.IsLoader {
+			return nil
+		}
 		if listAll && !strings.HasPrefix(f.Name, "firmwares") {
 			files[folder] = append(files[folder], f)
 		}