diff --git a/companion/src/CMakeLists.txt b/companion/src/CMakeLists.txt
index 21e4c29a6..0d6928b85 100644
--- a/companion/src/CMakeLists.txt
+++ b/companion/src/CMakeLists.txt
@@ -113,6 +113,7 @@ add_subdirectory(thirdparty/qxtcommandoptions)
 
 set(common_SRCS
   eeprominterface.cpp
+  radiodata.cpp
   firmwares/er9x/er9xeeprom.cpp
   firmwares/er9x/er9xinterface.cpp
   firmwares/ersky9x/ersky9xeeprom.cpp
diff --git a/companion/src/mainwindow.cpp b/companion/src/mainwindow.cpp
index 81f291355..657318ca0 100644
--- a/companion/src/mainwindow.cpp
+++ b/companion/src/mainwindow.cpp
@@ -611,48 +611,38 @@ void MainWindow::openRecentFile()
   }
 }
 
-void MainWindow::loadProfile()  //TODO Load all variables - Also HW!
+void MainWindow::loadProfile() // TODO Load all variables - Also HW!
 {
-    QAction *action = qobject_cast<QAction *>(sender());
-
-    if (action) {
-      // Set the new profile number
-      int profnum=action->data().toInt();
-      g.id( profnum );
-
-      current_firmware_variant = GetFirmware(g.profile[g.id()].fwType());
-
-      foreach (QMdiSubWindow *window, mdiArea->subWindowList()) {
-        MdiChild *mdiChild = qobject_cast<MdiChild *>(window->widget());
-        mdiChild->eepromInterfaceChanged();
-      }
-
-      updateMenus();
-    }
+  QAction * action = qobject_cast<QAction *>(sender());
+  if (action) {
+    // Set the new profile number
+    int profnum = action->data().toInt();
+    g.id(profnum);
+    current_firmware_variant = GetFirmware(g.profile[g.id()].fwType());
+    emit FirmwareChanged();
+    updateMenus();
+  }
 }
 
 void MainWindow::appPrefs()
 {
-    AppPreferencesDialog *pd = new AppPreferencesDialog(this);
-    pd->exec();
-    updateMenus();
+  AppPreferencesDialog * dialog = new AppPreferencesDialog(this);
+  dialog->exec();
+  updateMenus();
 }
 
 void MainWindow::fwPrefs()
 {
-    FirmwarePreferencesDialog *pd = new FirmwarePreferencesDialog(this);
-    pd->exec();
-    foreach (QMdiSubWindow *window, mdiArea->subWindowList()) {
-      MdiChild *mdiChild = qobject_cast<MdiChild *>(window->widget());
-      mdiChild->eepromInterfaceChanged();
-    }
-    updateMenus();
+  FirmwarePreferencesDialog * dialog = new FirmwarePreferencesDialog(this);
+  dialog->exec();
+  emit FirmwareChanged();
+  updateMenus();
 }
 
 void MainWindow::contributors()
 {
-    ContributorsDialog * dialog = new ContributorsDialog(this);
-    dialog->exec();
+  ContributorsDialog * dialog = new ContributorsDialog(this);
+  dialog->exec();
 }
 
 void MainWindow::sdsync()
@@ -785,16 +775,6 @@ bool MainWindow::readFirmwareFromRadio(const QString &filename)
   return result;
 }
 
-bool MainWindow::writeFirmwareToRadio(const QString &filename)
-{
-  ProgressDialog progressDialog(this, tr("Write Firmware to Radio"), CompanionIcon("write_flash.png"));
-  bool result = writeFirmware(filename, progressDialog.progress());
-  if (!result) {
-    progressDialog.exec();
-  }
-  return result;
-}
-
 bool MainWindow::readEepromFromRadio(const QString &filename)
 {
   ProgressDialog progressDialog(this, tr("Read Models and Settings from Radio"), CompanionIcon("read_eeprom.png"));
@@ -805,16 +785,6 @@ bool MainWindow::readEepromFromRadio(const QString &filename)
   return result;
 }
 
-bool MainWindow::writeEepromToRadio(const QString &filename)
-{
-  ProgressDialog progressDialog(this, tr("Write Models and Settings to Radio"), CompanionIcon("write_eeprom.png"));
-  bool result = ::writeEeprom(filename, progressDialog.progress());
-  if (!result) {
-    progressDialog.exec();
-  }
-  return result;
-}
-
 void MainWindow::writeBackup()
 {
   FlashEEpromDialog *cd = new FlashEEpromDialog(this);
@@ -823,8 +793,8 @@ void MainWindow::writeBackup()
 
 void MainWindow::writeFlash(QString fileToFlash)
 {
-    FlashFirmwareDialog *cd = new FlashFirmwareDialog(this);
-    cd->exec();
+  FlashFirmwareDialog * cd = new FlashFirmwareDialog(this);
+  cd->exec();
 }
 
 void MainWindow::readBackup()
@@ -929,9 +899,9 @@ void MainWindow::updateMenus()
     setWindowTitle(tr("OpenTX Companion %1 - Radio: %2 - Profile: %3").arg(VERSION).arg(GetCurrentFirmware()->getName()).arg(g.profile[g.id()].name()));
 }
 
-MdiChild *MainWindow::createMdiChild()
+MdiChild * MainWindow::createMdiChild()
 {
-  MdiChild * child = new MdiChild();
+  MdiChild * child = new MdiChild(this);
   mdiArea->addSubWindow(child);
   if (!child->parentWidget()->isMaximized() && !child->parentWidget()->isMinimized()) {
     child->parentWidget()->resize(400, 400);
diff --git a/companion/src/mainwindow.h b/companion/src/mainwindow.h
index 79b6dcab0..4aa012510 100644
--- a/companion/src/mainwindow.h
+++ b/companion/src/mainwindow.h
@@ -52,6 +52,9 @@ class MainWindow : public QMainWindow
 
   public:
     MainWindow();
+    
+  signals:
+    void FirmwareChanged();
 
   protected:
     QString getCompanionUpdateBaseUrl();
@@ -73,13 +76,9 @@ class MainWindow : public QMainWindow
     void setFILanguage()  { setLanguage("fi_FI"); };
     void setFRLanguage()  { setLanguage("fr_FR"); };
     void setITLanguage()  { setLanguage("it_IT"); };
-    void setHELanguage()  { setLanguage("he_IL"); };
     void setPLLanguage()  { setLanguage("pl_PL"); };
     void setESLanguage()  { setLanguage("es_ES"); };
-    void setPTLanguage()  { setLanguage("pt_PT"); };
-    void setRULanguage()  { setLanguage("ru_RU"); };
     void setSELanguage()  { setLanguage("sv_SE"); };
-    void setNLLanguage()  { setLanguage("nl_NL"); };
     void setCNLanguage()  { setLanguage("zh_CN"); };
 
     void setTheme(int index);
@@ -139,7 +138,7 @@ class MainWindow : public QMainWindow
     void fwPrefs();
     void updateMenus();
     void createProfile();
-    MdiChild *createMdiChild();
+    MdiChild * createMdiChild();
     void setActiveSubWindow(QWidget *window);
     QMenu * createRecentFileMenu();
     QMenu * createProfilesMenu();
@@ -164,18 +163,13 @@ class MainWindow : public QMainWindow
     void updateLanguageActions();
     void updateIconThemeActions();
     
-    QString Theme;
-    QString ISize;
     QString strippedName(const QString & fullFileName);
 
-    MdiChild *activeMdiChild();
-    QMdiSubWindow *findMdiChild(const QString & fileName);
-    int getEpromVersion(QString fileName);
+    MdiChild * activeMdiChild();
+    QMdiSubWindow * findMdiChild(const QString & fileName);
 
     bool readEepromFromRadio(const QString & filename);
-    bool writeEepromToRadio(const QString & filename);
     bool readFirmwareFromRadio(const QString & filename);
-    bool writeFirmwareToRadio(const QString & filename);
 
     QMdiArea *mdiArea;
     QSignalMapper *windowMapper;
@@ -198,7 +192,6 @@ class MainWindow : public QMainWindow
     QToolBar *helpToolBar;
     QAction *newAct;
     QAction *openAct;
-    QAction *recentAct;
     QAction *saveAct;
     QAction *saveAsAct;
     QAction *exitAct;
@@ -249,13 +242,9 @@ class MainWindow : public QMainWindow
     QAction *finnishLangAct;
     QAction *frenchLangAct;
     QAction *italianLangAct;
-    // QAction *hebrewLangAct;
     QAction *polishLangAct;
-    // QAction *portugueseLangAct;
     QAction *spanishLangAct;
     QAction *swedishLangAct;
-    // QAction *russianLangAct;
-    // QAction *dutchLangAct;
     QAction *chineseLangAct;
 
     QAction *openDocURLAct;
diff --git a/companion/src/mdichild.cpp b/companion/src/mdichild.cpp
index 2a820a732..205c82c46 100644
--- a/companion/src/mdichild.cpp
+++ b/companion/src/mdichild.cpp
@@ -39,15 +39,13 @@
 #include <unistd.h>
 #endif
 
-MdiChild::MdiChild():
+MdiChild::MdiChild(MainWindow * parent):
   QWidget(),
   ui(new Ui::MdiChild),
   firmware(GetCurrentFirmware()),
   isUntitled(true),
   fileChanged(false)
 {
-  BoardEnum board = GetCurrentFirmware()->getBoard();
-  
   ui->setupUi(this);
   setWindowIcon(CompanionIcon("open.png"));
   
@@ -56,7 +54,9 @@ MdiChild::MdiChild():
   ui->simulateButton->setIcon(CompanionIcon("simulate.png"));
   setAttribute(Qt::WA_DeleteOnClose);
   
-  eepromInterfaceChanged();
+  onFirmwareChanged();
+  
+  connect(parent, SIGNAL(FirmwareChanged()), this, SLOT(onFirmwareChanged()));
   
   connect(ui->modelsList, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(openModelEditWindow()));
   connect(ui->modelsList, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(showModelsListContextMenu(const QPoint &)));
@@ -70,14 +70,6 @@ MdiChild::MdiChild():
   // ui->modelsList->setDragDropOverwriteMode(true);
   // ui->modelsList->setDropIndicatorShown(true);
   
-  if (IS_HORUS(board)) {
-    ui->modelsList->header()->hide();
-  }
-  else {
-    ui->modelsList->setIndentation(0);
-  }
-
-  
   if (!(isMaximized() || isMinimized())) {
     adjustSize();
   }
@@ -94,7 +86,7 @@ void MdiChild::refresh(bool expand)
   if (1 || expand) {
     ui->modelsList->expandAll();
   }
-  ui->simulateButton->setEnabled(GetCurrentFirmware()->getCapability(Simulation));
+  ui->simulateButton->setEnabled(firmware->getCapability(Simulation));
   updateTitle();
 }
 
@@ -147,7 +139,7 @@ void MdiChild::showModelsListContextMenu(const QPoint & pos)
     contextMenu.addSeparator();
     contextMenu.addAction(CompanionIcon("simulate.png"), tr("&Simulate model"), this, SLOT(modelSimulate()), tr("Alt+S"));
   }
-  else if (IS_HORUS(GetCurrentFirmware()->getBoard())) {
+  else if (IS_HORUS(firmware->getBoard())) {
     if (modelsListModel->getCategoryIndex(modelIndex) >= 0) {
       contextMenu.addAction(CompanionIcon("add.png"), tr("&Add model"), this, SLOT(modelAdd()));
     }
@@ -162,8 +154,19 @@ void MdiChild::showModelsListContextMenu(const QPoint & pos)
   contextMenu.exec(globalPos);
 }
 
-void MdiChild::eepromInterfaceChanged()
+void MdiChild::onFirmwareChanged()
 {
+  Firmware * previous = firmware;
+  firmware = GetCurrentFirmware();
+  qDebug() << "onFirmwareChanged" << previous->getName() << "=>" << firmware->getName();
+  
+  BoardEnum board = firmware->getBoard();
+  ui->modelsList->header()->setVisible(!IS_HORUS(board));
+  if (IS_HORUS(board))
+    ui->modelsList->resetIndentation();
+  else
+    ui->modelsList->setIndentation(0);
+  radioData.convert(previous, firmware);
   refresh();
 }
 
@@ -223,7 +226,7 @@ void MdiChild::doPaste(QByteArray * gmData, int index)
       size += sizeof(GeneralSettings);
     }
     else if (c == 'M') {
-      if (GetCurrentFirmware()->getCapability(Models) == 0 || index < GetCurrentFirmware()->getCapability(Models)) {
+      if (firmware->getCapability(Models) == 0 || index < firmware->getCapability(Models)) {
         // Model data
         int ret = QMessageBox::Yes;
         if (!radioData.models[index].isEmpty()) {
@@ -274,7 +277,7 @@ bool MdiChild::hasSelection() const
 
 void MdiChild::updateTitle()
 {
-  QString title = userFriendlyCurrentFile() + "[*]" + " (" + GetCurrentFirmware()->getName() + QString(")");
+  QString title = userFriendlyCurrentFile() + "[*]" + " (" + firmware->getName() + QString(")");
   int availableEEpromSize = modelsListModel->getAvailableEEpromSize();
   if (availableEEpromSize >= 0) {
     title += QString(" - %1 ").arg(availableEEpromSize) + tr("free bytes");
@@ -327,7 +330,7 @@ void MdiChild::checkAndInitModel(int row)
 
 void MdiChild::generalEdit()
 {
-  GeneralEdit * t = new GeneralEdit(this, radioData, GetCurrentFirmware()/*firmware*/);
+  GeneralEdit * t = new GeneralEdit(this, radioData, firmware);
   connect(t, SIGNAL(modified()), this, SLOT(setModified()));
   t->show();
 }
@@ -364,7 +367,7 @@ void MdiChild::modelEdit()
   ModelData & model = radioData.models[row];
   gStopwatch.restart();
   gStopwatch.report("ModelEdit creation");
-  ModelEdit * t = new ModelEdit(this, radioData, (row), GetCurrentFirmware()/*firmware*/);
+  ModelEdit * t = new ModelEdit(this, radioData, (row), firmware);
   gStopwatch.report("ModelEdit created");
   t->setWindowTitle(tr("Editing model %1: ").arg(row+1) + model.name);
   connect(t, SIGNAL(modified()), this, SLOT(setModified()));
@@ -581,10 +584,10 @@ void MdiChild::print(int model, const QString & filename)
   PrintDialog * pd = NULL;
 
   if (model>=0 && !filename.isEmpty()) {
-    pd = new PrintDialog(this, GetCurrentFirmware()/*firmware*/, radioData.generalSettings, radioData.models[model], filename);
+    pd = new PrintDialog(this, firmware, radioData.generalSettings, radioData.models[model], filename);
   }
   else if (getCurrentRow()) {
-    pd = new PrintDialog(this, GetCurrentFirmware()/*firmware*/, radioData.generalSettings, radioData.models[getCurrentRow()]);
+    pd = new PrintDialog(this, firmware, radioData.generalSettings, radioData.models[getCurrentRow()]);
   }
 
   if (pd) {
diff --git a/companion/src/mdichild.h b/companion/src/mdichild.h
index 634290a1d..45510f557 100644
--- a/companion/src/mdichild.h
+++ b/companion/src/mdichild.h
@@ -25,18 +25,20 @@
 #include "modelslist.h"
 #include <QtGui>
 
+class MainWindow;
+
 namespace Ui {
 class MdiChild;
 }
 
 class MdiChild : public QWidget
 {
-    friend class ModelsListWidget;
+    // friend class ModelsListWidget;
 
     Q_OBJECT
 
   public:
-    MdiChild();
+    MdiChild(MainWindow * parent);
     ~MdiChild();
 
     void newFile();
@@ -49,7 +51,6 @@ class MdiChild : public QWidget
     QString userFriendlyCurrentFile() const;
     QString currentFile() const { return curFile; }
     void viableModelSelected(bool viable);
-    void eepromInterfaceChanged();
     int getCurrentRow() const;
     void refresh(bool expand=false);
     void keyPressEvent(QKeyEvent * event);
@@ -65,6 +66,7 @@ class MdiChild : public QWidget
     void on_simulateButton_clicked();
     void on_radioSettings_clicked();
     void setDefault();
+    void onFirmwareChanged();
   
   public slots:
     void showModelsListContextMenu(const QPoint & pos);
diff --git a/companion/src/radiodata.cpp b/companion/src/radiodata.cpp
new file mode 100644
index 000000000..64aed81ef
--- /dev/null
+++ b/companion/src/radiodata.cpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) OpenTX
+ *
+ * Based on code named
+ *   th9x - http://code.google.com/p/th9x
+ *   er9x - http://code.google.com/p/er9x
+ *   gruvin9x - http://code.google.com/p/gruvin9x
+ *
+ * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "radiodata.h"
+#include "eeprominterface.h"
+
+// TODO here we will move a lot of functions from eeprominterface.cpp when no merge risk
+
+void ModelData::convert(Firmware * before, Firmware * after)
+{
+  // Here we can add explicit conversions when moving from one board to another
+}
+
+void GeneralSettings::convert(Firmware * before, Firmware * after)
+{
+  // Here we can add explicit conversions when moving from one board to another
+}
+
+void RadioData::convert(Firmware * before, Firmware * after)
+{
+  generalSettings.convert(before, after);
+  for (unsigned i=0; i<models.size(); i++) {
+    models[i].convert(before, after);
+  }
+}
\ No newline at end of file
diff --git a/companion/src/radiodata.h b/companion/src/radiodata.h
index 2de2738f8..4d339a9dc 100644
--- a/companion/src/radiodata.h
+++ b/companion/src/radiodata.h
@@ -5,6 +5,8 @@
 #include <QString>
 #include <QComboBox>
 
+class Firmware;
+
 enum Switches {
   SWITCH_NONE,
 
@@ -1004,7 +1006,9 @@ class ModelData {
     ModelData();
     ModelData(const ModelData & src);
     ModelData & operator = (const ModelData & src);
-
+    
+    void convert(Firmware * before, Firmware * after);
+    
     ExpoData * insertInput(const int idx);
     void removeInput(const int idx);
 
@@ -1144,6 +1148,7 @@ class GeneralSettings {
     };
 
     GeneralSettings();
+    void convert(Firmware * before, Firmware * after);
 
     int getDefaultStick(unsigned int channel) const;
     RawSource getDefaultSource(unsigned int channel) const;
@@ -1269,6 +1274,8 @@ class RadioData {
     GeneralSettings generalSettings;
     std::vector<CategoryData> categories;
     std::vector<ModelData> models;
+    
+    void convert(Firmware * before, Firmware * after);
 
     void setCurrentModel(unsigned int index)
     {