diff --git a/radio/src/io/multi_firmware_update.h b/radio/src/io/multi_firmware_update.h
index a4cb255fb..e13880184 100644
--- a/radio/src/io/multi_firmware_update.h
+++ b/radio/src/io/multi_firmware_update.h
@@ -76,7 +76,7 @@ class MultiFirmwareInformation {
 
     bool isMultiExternalFirmware() const
     {
-      return (telemetryInversion == true && optibootSupport == true && bootloaderCheck == true && telemetryType == FIRMWARE_MULTI_TELEM_MULTI_TELEMETRY);
+      return ((telemetryInversion == true || boardType == FIRMWARE_MULTI_STM ) && optibootSupport == true && bootloaderCheck == true && telemetryType == FIRMWARE_MULTI_TELEM_MULTI_TELEMETRY);
     }
 
     const char * readMultiFirmwareInformation(const char * filename);