diff --git a/companion/src/eeprominterface.cpp b/companion/src/eeprominterface.cpp
index 069de327b..8ff58eb7b 100644
--- a/companion/src/eeprominterface.cpp
+++ b/companion/src/eeprominterface.cpp
@@ -1765,6 +1765,33 @@ QString getBoardName(BoardEnum board)
   }
 }
 
+const int Firmware::getFlashSize()
+{
+  switch (board) {
+    case BOARD_STOCK:
+      return FSIZE_STOCK;
+    case BOARD_M128:
+      return FSIZE_M128;
+    case BOARD_MEGA2560:
+    case BOARD_GRUVIN9X:
+      return FSIZE_GRUVIN9X;
+    case BOARD_SKY9X:
+      return FSIZE_SKY9X;
+    case BOARD_9XRPRO:
+    case BOARD_AR9X:
+      return FSIZE_9XRPRO;
+    case BOARD_TARANIS:
+    case BOARD_TARANIS_PLUS:
+    case BOARD_TARANIS_X9E:
+    case BOARD_FLAMENCO:
+      return FSIZE_TARANIS;
+    case BOARD_HORUS:
+      return FSIZE_HORUS;
+    default:
+      return 0;
+  }
+}
+
 Firmware * GetFirmware(QString id)
 {
   foreach(Firmware * firmware, firmwares) {
diff --git a/companion/src/eeprominterface.h b/companion/src/eeprominterface.h
index 4baf3e596..1adf9cf8e 100644
--- a/companion/src/eeprominterface.h
+++ b/companion/src/eeprominterface.h
@@ -37,6 +37,15 @@
 #define EESIZE_9XRPRO          (128*4096)
 #define EESIZE_MAX             EESIZE_9XRPRO
 
+#define FSIZE_STOCK            (64*1024)
+#define FSIZE_M128             (128*1024)
+#define FSIZE_GRUVIN9X         (256*1024)
+#define FSIZE_TARANIS          (512*1024)
+#define FSIZE_SKY9X            (256*1024)
+#define FSIZE_9XRPRO           (512*1024)
+#define FSIZE_HORUS            (2048*1024)
+#define FSIZE_MAX              FSIZE_HORUS
+
 QString getBoardName(BoardEnum board);
 
 #define IS_9X(board)           (board==BOARD_STOCK || board==BOARD_M128)
@@ -1671,6 +1680,8 @@ class Firmware {
     virtual bool isTelemetrySourceAvailable(int source) = 0;
 
     virtual int isAvailable(PulsesProtocol proto, int port=0) = 0;
+    
+    const int getFlashSize();
 
   public:
     QList<const char *> languages;
diff --git a/companion/src/firmwareinterface.cpp b/companion/src/firmwareinterface.cpp
index 889cd427a..49e488bce 100644
--- a/companion/src/firmwareinterface.cpp
+++ b/companion/src/firmwareinterface.cpp
@@ -44,7 +44,7 @@ int getFileType(const QString &fullFileName)
 }
 
 FirmwareInterface::FirmwareInterface(const QString &filename):
-  flash(MAX_FSIZE, 0),
+  flash(FSIZE_MAX, 0),
   flashSize(0),
   versionId(0),
   eepromVersion(0),
@@ -59,11 +59,11 @@ FirmwareInterface::FirmwareInterface(const QString &filename):
     QFile file(filename);
     if (file.open(QIODevice::ReadOnly | QIODevice::Text)) { // reading HEX TEXT file
       QTextStream inputStream(&file);
-      flashSize = HexInterface(inputStream).load((uint8_t *)flash.data(), MAX_FSIZE);
+      flashSize = HexInterface(inputStream).load((uint8_t *)flash.data(), FSIZE_MAX);
       file.close();
       if (flashSize == 0) {
         file.open(QIODevice::ReadOnly);
-        flashSize = file.read((char *)flash.data(), MAX_FSIZE);
+        flashSize = file.read((char *)flash.data(), FSIZE_MAX);
       }
     }
   }
@@ -342,7 +342,10 @@ bool FirmwareInterface::isValid()
 
 unsigned int FirmwareInterface::save(QString fileName)
 {
-  uint8_t binflash[MAX_FSIZE];
+  uint8_t *binflash  = (uint8_t*)malloc(FSIZE_MAX);
+  if (binflash == NULL) {
+    return -1;
+  }
   memcpy(&binflash, flash.constData(), flashSize);
   QFile file(fileName);
   
@@ -350,6 +353,7 @@ unsigned int FirmwareInterface::save(QString fileName)
 
   if (fileType == FILE_TYPE_HEX) {
     if (!file.open(QIODevice::ReadWrite | QIODevice::Truncate | QIODevice::Text)) { //reading HEX TEXT file
+      free(binflash);
       return -1;
     }
     QTextStream outputStream(&file);
@@ -358,6 +362,7 @@ unsigned int FirmwareInterface::save(QString fileName)
   }
   else {
     if (!file.open(QIODevice::ReadWrite | QIODevice::Truncate)) { //reading HEX TEXT file
+      free(binflash);
       return -1;
     }
     file.write((char*)binflash, flashSize);
@@ -365,5 +370,6 @@ unsigned int FirmwareInterface::save(QString fileName)
 
   file.close();
 
+  free(binflash);
   return flashSize;
 }
diff --git a/companion/src/firmwareinterface.h b/companion/src/firmwareinterface.h
index 6f78e82ba..0171d91ea 100644
--- a/companion/src/firmwareinterface.h
+++ b/companion/src/firmwareinterface.h
@@ -19,7 +19,6 @@
 #include <QImage>
 #include <QByteArray>
 
-#define MAX_FSIZE (512*1024)
 #define SPLASH_WIDTH (128)
 #define SPLASH_HEIGHT (64)
 #define SPLASHX9D_WIDTH (212)
diff --git a/companion/src/mainwindow.cpp b/companion/src/mainwindow.cpp
index be359f1d3..31e5967a6 100644
--- a/companion/src/mainwindow.cpp
+++ b/companion/src/mainwindow.cpp
@@ -920,15 +920,38 @@ void MainWindow::about()
 void MainWindow::updateMenus()
 {
     bool hasMdiChild = (activeMdiChild() != 0);
-    saveAct->setEnabled(hasMdiChild);
-    saveAsAct->setEnabled(hasMdiChild);
-    pasteAct->setEnabled(hasMdiChild ? activeMdiChild()->hasPasteData() : false);
-    writeEepromAct->setEnabled(hasMdiChild);
-    separatorAct->setVisible(hasMdiChild);
-
     bool hasSelection = (activeMdiChild() && activeMdiChild()->hasSelection());
-    cutAct->setEnabled(hasSelection);
-    copyAct->setEnabled(hasSelection);
+
+    if(GetCurrentFirmware()->getBoard() == BOARD_HORUS) {
+      newAct->setEnabled(false);
+      openAct->setEnabled(false);
+      saveAct->setEnabled(false);
+      saveAsAct->setEnabled(false);
+      writeEepromAct->setEnabled(false);
+      readEepromAct->setEnabled(false);
+      writeBackupToRadioAct->setEnabled(false);
+      readBackupToFileAct->setEnabled(false);
+      cutAct->setEnabled(false);
+      copyAct->setEnabled(false);
+      pasteAct->setEnabled(false);
+      for (int i=0; i<MAX_RECENT; ++i)
+        recentFileActs[i]->setEnabled(false);
+    } else {
+      newAct->setEnabled(true);
+      openAct->setEnabled(true);
+      saveAct->setEnabled(hasMdiChild);
+      saveAsAct->setEnabled(hasMdiChild);
+      cutAct->setEnabled(hasSelection);
+      copyAct->setEnabled(hasSelection);
+      pasteAct->setEnabled(hasMdiChild ? activeMdiChild()->hasPasteData() : false);
+      writeEepromAct->setEnabled(hasMdiChild);
+      readEepromAct->setEnabled(true);
+      writeBackupToRadioAct->setEnabled(true);
+      readBackupToFileAct->setEnabled(true);
+      for (int i=0; i<MAX_RECENT; ++i)
+        recentFileActs[i]->setEnabled(true);
+    }
+    separatorAct->setVisible(hasMdiChild);
     simulateAct->setEnabled(hasSelection);
     printAct->setEnabled(hasSelection);
     loadbackupAct->setEnabled(hasMdiChild);
@@ -1448,6 +1471,8 @@ void MainWindow::dragEnterEvent(QDragEnterEvent *event)
 
 void MainWindow::dropEvent(QDropEvent *event)
 {
+    if(GetCurrentFirmware()->getBoard()== BOARD_HORUS)
+      return;
     QList<QUrl> urls = event->mimeData()->urls();
     if (urls.isEmpty())
       return;
diff --git a/companion/src/radiointerface.cpp b/companion/src/radiointerface.cpp
index dc8d1359a..efc0b3e57 100644
--- a/companion/src/radiointerface.cpp
+++ b/companion/src/radiointerface.cpp
@@ -66,7 +66,7 @@ QStringList getDfuArgs(const QString & cmd, const QString & filename)
   burnConfigDialog bcd;
   QString memory = "0x08000000";
   if (cmd == "-U") {
-    memory.append(QString(":%1").arg(MAX_FSIZE));
+    memory.append(QString(":%1").arg(GetCurrentFirmware()->getFlashSize()));
   }
   args << bcd.getDFUArgs();
   if (!filename.endsWith(".dfu")) {