diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index 65abe0833..14d70483e 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -1595,7 +1595,7 @@ class CurvesField: public TransformedField {
 
       for (int i=0; i<maxCurves; i++) {
         CurveData * curve = &curves[i];
-        if (!IS_STM32(board) || version < 216) {
+        if (!IS_ARM(board) || (!IS_STM32(board) && version < 218) || version < 216) {
           int * next = &_points[5*(i+1) + _curves[i]];
           int size = next - cur;
           if (size % 2 == 0) {
diff --git a/companion/src/firmwares/opentx/opentxinterface.cpp b/companion/src/firmwares/opentx/opentxinterface.cpp
index 5b51dc0a7..874cf46d3 100644
--- a/companion/src/firmwares/opentx/opentxinterface.cpp
+++ b/companion/src/firmwares/opentx/opentxinterface.cpp
@@ -26,6 +26,7 @@
 #include <QMessageBox>
 #include <QTime>
 #include <QUrl>
+#include <companion/src/storage/storage.h>
 
 using namespace Board;
 
@@ -95,30 +96,6 @@ const char * OpenTxEepromInterface::getName()
   }
 }
 
-uint32_t OpenTxEepromInterface::getFourCC()
-{
-  switch (board) {
-    case BOARD_X12S:
-    case BOARD_X10:
-      return 0x3478746F;
-    case BOARD_TARANIS_X7:
-      return 0x3678746F;
-    case BOARD_TARANIS_X9E:
-      return 0x3578746F;
-    case BOARD_TARANIS_X9D:
-    case BOARD_TARANIS_X9DP:
-      return 0x3378746F;
-    case BOARD_SKY9X:
-    case BOARD_AR9X:
-      return 0x3278746F;
-    case BOARD_MEGA2560:
-    case BOARD_GRUVIN9X:
-      return 0x3178746F;
-    default:
-      return 0;
-  }
-}
-
 bool OpenTxEepromInterface::loadRadioSettingsFromRLE(GeneralSettings & settings, RleFile * rleFile, uint8_t version)
 {
   QByteArray data(sizeof(settings), 0); // GeneralSettings should be always bigger than the EEPROM struct
@@ -163,7 +140,7 @@ bool OpenTxEepromInterface::saveToByteArray(const T & src, QByteArray & data, ui
   // manager.Dump();
   manager.Export(raw);
   data.resize(8);
-  *((uint32_t*)&data.data()[0]) = getFourCC();
+  *((uint32_t*)&data.data()[0]) = StorageFormat::getFourCC(board);
   data[4] = version;
   data[5] = 'M';
   *((uint16_t*)&data.data()[6]) = raw.size();
@@ -186,12 +163,12 @@ template <class T, class M>
 bool OpenTxEepromInterface::loadFromByteArray(T & dest, const QByteArray & data)
 {
   uint32_t fourcc = *((uint32_t*)&data.data()[0]);
-  if (getFourCC() != fourcc) {
+  if (StorageFormat::getFourCC(board) != fourcc) {
     if (IS_HORUS(board) && fourcc == 0x3178396F) {
-      qDebug() << QString().sprintf("%s: Deprecated fourcc used %x vs %x", getName(), fourcc, getFourCC());
+      qDebug() << QString().sprintf("%s: Deprecated fourcc used %x vs %x", getName(), fourcc, StorageFormat::getFourCC(board));
     }
     else {
-      qDebug() << QString().sprintf("%s: Wrong fourcc %x vs %x", getName(), fourcc, getFourCC());
+      qDebug() << QString().sprintf("%s: Wrong fourcc %x vs %x", getName(), fourcc, StorageFormat::getFourCC(board));
       return false;
     }
   }
diff --git a/companion/src/firmwares/opentx/opentxinterface.h b/companion/src/firmwares/opentx/opentxinterface.h
index f9cfdf745..c8f659de1 100644
--- a/companion/src/firmwares/opentx/opentxinterface.h
+++ b/companion/src/firmwares/opentx/opentxinterface.h
@@ -72,8 +72,6 @@ class OpenTxEepromInterface : public EEPROMInterface
     
     uint8_t getLastDataVersion(Board::Type board);
     
-    uint32_t getFourCC();
-    
     RleFile * efile;
     
     OpenTxFirmware * firmware;
diff --git a/companion/src/mdichild.cpp b/companion/src/mdichild.cpp
index 7676e9b49..bddacd7ef 100644
--- a/companion/src/mdichild.cpp
+++ b/companion/src/mdichild.cpp
@@ -702,7 +702,7 @@ void MdiChild::onFirmwareChanged()
   Firmware * previous = firmware;
   firmware = getCurrentFirmware();
   //qDebug() << "onFirmwareChanged" << previous->getName() << "=>" << firmware->getName();
-  if (previous->getBoard() != firmware->getBoard()) {
+  if (StorageFormat::getFourCC(previous->getBoard()) != StorageFormat::getFourCC(firmware->getBoard())) {
     convertStorage(previous->getBoard(), firmware->getBoard());
     setModified();
   }
diff --git a/companion/src/storage/storage.h b/companion/src/storage/storage.h
index e1af73b5c..aa288451f 100644
--- a/companion/src/storage/storage.h
+++ b/companion/src/storage/storage.h
@@ -67,15 +67,38 @@ class StorageFormat
       return board;
     }
 
+    static uint32_t getFourCC(Board::Type board)
+    {
+      switch (board) {
+        case Board::BOARD_X12S:
+        case Board::BOARD_X10:
+          return 0x3478746F;
+        case Board::BOARD_TARANIS_X7:
+          return 0x3678746F;
+        case Board::BOARD_TARANIS_X9E:
+          return 0x3578746F;
+        case Board::BOARD_TARANIS_X9D:
+        case Board::BOARD_TARANIS_X9DP:
+          return 0x3378746F;
+        case Board::BOARD_SKY9X:
+        case Board::BOARD_AR9X:
+          return 0x3278746F;
+        case Board::BOARD_MEGA2560:
+        case Board::BOARD_GRUVIN9X:
+          return 0x3178746F;
+        default:
+          return 0;
+      }
+    }
+
+    uint32_t getFourCC()
+    {
+      return getFourCC(board);
+    }
+
     virtual bool isBoardCompatible(Board::Type board)
     {
-      if (this->board == board)
-        return true;
-
-      if (IS_TARANIS_X9D(this->board) && IS_TARANIS_X9D(board))
-        return true;
-
-      return false;
+      return getFourCC() == getFourCC(board);
     }
 
   protected: