diff --git a/src/main/java/nsusbloader/RainbowHexDump.java b/src/main/java/nsusbloader/RainbowHexDump.java
index 1086840..d3131ad 100644
--- a/src/main/java/nsusbloader/RainbowHexDump.java
+++ b/src/main/java/nsusbloader/RainbowHexDump.java
@@ -47,6 +47,18 @@ public class RainbowHexDump {
                 + "\n");
     }
 
+    public static void hexDumpUTF8ForWin(byte[] byteArray){
+        for (int i=0; i < byteArray.length; i++)
+            System.out.print(String.format("%02d-", i%100));
+        System.out.println(">"+byteArray.length);
+        for (byte b: byteArray)
+            System.out.print(String.format("%02x ", b));
+        System.out.println();
+        System.out.print("\t\t\t"
+                + new String(byteArray, StandardCharsets.UTF_8)
+                + "\n");
+    }
+
     public static void hexDumpUTF16LE(byte[] byteArray){
         System.out.print(ANSI_BLUE);
         for (int i=0; i < byteArray.length; i++)
diff --git a/src/main/java/nsusbloader/Utilities/NxdtUsbAbi1.java b/src/main/java/nsusbloader/Utilities/NxdtUsbAbi1.java
index 682c94e..5b1f18f 100644
--- a/src/main/java/nsusbloader/Utilities/NxdtUsbAbi1.java
+++ b/src/main/java/nsusbloader/Utilities/NxdtUsbAbi1.java
@@ -104,8 +104,8 @@ class NxdtUsbAbi1 {
             while (true){
                 directive = readUsbDirective();
 
-                RainbowHexDump.hexDumpUTF8(directive);
-                
+                RainbowHexDump.hexDumpUTF8ForWin(directive);
+
                 if (isInvalidDirective(directive))
                     continue;
 
@@ -123,6 +123,7 @@ class NxdtUsbAbi1 {
                         return;
                     default:
                         writeUsb(USBSTATUS_UNSUPPORTED_CMD);
+                        logPrinter.print("Unsupported command: " + command, EMsgType.FAIL);
                 }
             }
         }
@@ -142,7 +143,7 @@ class NxdtUsbAbi1 {
             logPrinter.print("Invalid 'MAGIC'", EMsgType.INFO);
             return true;
         }
-        if (message.length != NXDT_COMMAND_SIZE){
+        if (message.length < 0x10){
             writeUsb(USBSTATUS_MALFORMED_REQUEST);
             logPrinter.print("Invalid directive size. Expected size is 4096 while received is "+message.length, EMsgType.INFO);
             return true;
@@ -160,10 +161,9 @@ class NxdtUsbAbi1 {
 
         if (ABI_VERSION != versionABI){
             writeUsb(USBSTATUS_UNSUPPORTED_ABI);
-            throw new Exception("ABI v"+message[11]+" is not supported in current version.");
+            throw new Exception("ABI v"+versionABI+" is not supported in current version.");
         }
         writeUsb(USBSTATUS_SUCCESS);
-        // consider refactoring: create sub-classes for various ABI versions and check if it's supported or not
     }
 
     private void handleSendFileProperties(byte[] message) throws Exception{
@@ -171,25 +171,15 @@ class NxdtUsbAbi1 {
         final int fileNameLen = getLEint(message, 0x18);
         String filename = new String(message, 0x20, fileNameLen, StandardCharsets.UTF_8);
 
-        // TODO: In here should be also a field with NSP Header size that would be transmitted after the end of main data transfer; NOTE: Handle with RandomAccessFile.
-
         logPrinter.print("Write request for: '"+filename+"' ("+fileSize+" bytes)", EMsgType.INFO);
         // If RomFs related
-        if (filename.startsWith("/")) {
+        if (isRomFs(filename)) {
             if (isWindows)
                 filename = saveToPath + filename.replaceAll("/", "\\\\");
             else
                 filename = saveToPath + filename;
 
-            try {
-                createPath(filename);
-            }
-            catch (Exception e){
-                writeUsb(USBSTATUS_HOSTIOERROR);
-                logPrinter.print("Unable to create dir(s) for file in "+filename+
-                        "\n         Returned: "+e.getMessage(), EMsgType.FAIL);
-                return;
-            }
+            createPath(filename);
         }
         else
             filename =  saveToPath + filename;
@@ -197,9 +187,9 @@ class NxdtUsbAbi1 {
         File fileToDump = new File(filename);
 
         // Check if enough space
-        if (fileToDump.getFreeSpace() <= fileSize){
+        if (fileToDump.getParentFile().getFreeSpace() <= fileSize){
             writeUsb(USBSTATUS_HOSTIOERROR);
-            logPrinter.print("Not enough space on selected volume. Need: "+fileSize+" while available: "+fileToDump.getFreeSpace(), EMsgType.FAIL);
+            logPrinter.print("Not enough space on selected volume. Need: "+fileSize+" while available: "+fileToDump.getParentFile().getFreeSpace(), EMsgType.FAIL);
             return;
         }
         // Check if FS is NOT read-only
@@ -209,42 +199,14 @@ class NxdtUsbAbi1 {
             return;
         }
 
+        writeUsb(USBSTATUS_SUCCESS);
+
         dumpFile(fileToDump, fileSize);
 
         writeUsb(USBSTATUS_SUCCESS);
 
-        // TODO: check if NSP_SIZE != 0 then go dump header
     }
 
-    private void createPath(String path) throws Exception{
-        // QA NOTE: Clarify if exception is even possible on RO FS.
-
-        File resultingFile = new File(path);
-        File folderForTheFile = resultingFile.getParentFile();
-        folderForTheFile.mkdirs();
-    }
-
-    private void dumpFile(File file, long size) throws Exception{
-        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file, false));
-
-        byte[] readBuffer;
-        long received = 0;
-        int bufferSize;
-
-        while (received < size){
-            readBuffer = readUsbFile();
-            bos.write(readBuffer);
-            bufferSize = readBuffer.length;
-            received += bufferSize;
-
-            logPrinter.updateProgress((received + bufferSize) / (size / 100.0) / 100.0);
-        }
-
-        logPrinter.updateProgress(1.0);
-        bos.close();
-    }
-
-
     private int getLEint(byte[] bytes, int fromOffset){
         return ByteBuffer.wrap(bytes, fromOffset, 0x4).order(ByteOrder.LITTLE_ENDIAN).getInt();
     }
@@ -253,6 +215,45 @@ class NxdtUsbAbi1 {
         return ByteBuffer.wrap(bytes, fromOffset, 0x8).order(ByteOrder.LITTLE_ENDIAN).getLong();
     }
 
+    private boolean isRomFs(String filename){
+        return filename.startsWith("/");
+    }
+
+    private void createPath(String path) throws Exception{
+        File resultingFile = new File(path);
+        File folderForTheFile = resultingFile.getParentFile();
+
+        if (folderForTheFile.exists())
+            return;
+
+        if (folderForTheFile.mkdirs())
+            return;
+
+        writeUsb(USBSTATUS_HOSTIOERROR);
+        throw new Exception("Unable to create dir(s) for file in "+folderForTheFile);
+    }
+
+    private void dumpFile(File file, long size) throws Exception{
+        RandomAccessFile raf = new RandomAccessFile(file, "rw");
+
+        byte[] readBuffer;
+        long received = 0;
+        int bufferSize;
+
+        while (received < size){
+            readBuffer = readUsbFile();
+            raf.write(readBuffer);
+            bufferSize = readBuffer.length;
+            received += bufferSize;
+
+            logPrinter.updateProgress((received + bufferSize) / (size / 100.0) / 100.0);
+        }
+
+        logPrinter.updateProgress(1.0);
+        raf.close();
+    }
+
+
     /**
      * Sending any byte array to USB device
      * @return 'false' if no issues
diff --git a/src/main/resources/res/nxdt_icon.jpg b/src/main/resources/res/nxdt_icon.jpg
deleted file mode 100644
index f4d2627..0000000
Binary files a/src/main/resources/res/nxdt_icon.jpg and /dev/null differ