There is a PMU chip on X10 Exprress. SD Manager dynamic menu updated.

radio/src/gui/480x272/radio_sdmanager.cpp

@@ -180,6 +180,13 @@ void onSdManagerMenu(const char * result)
     bluetooth.flashFirmware(lfn);
   }
 #endif
+#if defined(HARDWARE_POWER_MANAGEMENT_UNIT)
+  else if (result == STR_FLASH_POWER_MANAGEMENT_UNIT) {
+    getSelectionFullPath(lfn);
+    FrskyChipFirmwareUpdate device;
+    device.flashFirmware(lfn);
+  }
+#endif
 #if defined(MULTIMODULE)
 #if defined(INTERNAL_MODULE_MULTI)
   else if (result == STR_FLASH_INTERNAL_MULTI) {

radio/src/targets/horus/CMakeLists.txt

@@ -47,6 +47,7 @@ if (PCB STREQUAL X10)
     option(INTERNAL_MODULE_PXX1 "Support for PXX1 internal module" OFF)
     option(INTERNAL_MODULE_PXX2 "Support for PXX2 internal module" ON)
     set(BLUETOOTH ON)
+    add_definitions(-DHARDWARE_POWER_MANAGEMENT_UNIT)
   elseif (PCBREV STREQUAL T16)
     set(FLAVOUR t16)
     set(LUA_EXPORT lua_export_t16)