diff --git a/companion/src/firmwares/opentx/opentxM128simulator.cpp b/companion/src/firmwares/opentx/opentxM128simulator.cpp
index b5ba97093..d92eae2b3 100644
--- a/companion/src/firmwares/opentx/opentxM128simulator.cpp
+++ b/companion/src/firmwares/opentx/opentxM128simulator.cpp
@@ -46,6 +46,8 @@
 #define GPS
 #define FAI_CHOICE
 #define FRSKY_STICKS
+#define DSM2
+#define DSM2_PPM
 
 #define EEPROM_VARIANT SIMU_M128_VARIANTS
 #define GAUGES
diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index 1ac4d84fc..d17afe577 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -2424,7 +2424,7 @@ OpenTxModelData::OpenTxModelData(ModelData & modelData, BoardEnum board, unsigne
   if (IS_ARM(board))
     internalField.Append(new UnsignedField<3>(modelData.telemetryProtocol));
   else
-    internalField.Append(new ConversionField< SignedField<3> >(modelData.moduleData[0].protocol, &protocolsConversionTable, "Protocol", ::QObject::tr("OpenTX doesn't accept this protocol")));
+    internalField.Append(new ConversionField< UnsignedField<3> >((unsigned int &)modelData.moduleData[0].protocol, &protocolsConversionTable, "Protocol", ::QObject::tr("OpenTX doesn't accept this protocol")));
 
   internalField.Append(new BoolField<1>(modelData.thrTrim));