diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index 9e186e0950b..7724497c8f2 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -2910,10 +2910,17 @@ void OpenTxModelData::afterImport()
     }
   }
 
+  // EX1 / EX2
   if (version <= 218 && IS_HORUS_X10(board) && modelData.thrTraceSrc > 3) {
     modelData.thrTraceSrc += 2;
   }
 
+  // EX3 / EX4
+  if (version <= 220 && (IS_HORUS_X10(board) || IS_FAMILY_T16(board)) &&
+      modelData.thrTraceSrc > 5) {
+    modelData.thrTraceSrc += 2;
+  }
+
   //  TODO remove when enum not radio specific requires eeprom change and conversion
   //  Note: this must mirror reverse beforeExport
   if (!IS_FLYSKY_NV14(board))