diff --git a/src/M5Unified.hpp b/src/M5Unified.hpp
index 5c272cf..59410e9 100644
--- a/src/M5Unified.hpp
+++ b/src/M5Unified.hpp
@@ -380,7 +380,6 @@ namespace m5
 #endif
 #endif
         if (board == board_t::board_unknown) { board = Display.getBoardCandidate(); }
-        if (board == board_t::board_unknown) { board = _check_boardtype(board); }
         if (board == board_t::board_unknown) { board = _default_fallback_board(); }
       }
       _board = board;
@@ -784,7 +783,6 @@ namespace m5
     void _begin_audio(config_t& cfg);
     bool _begin_rtc_imu(const config_t& cfg);
 
-    board_t _check_boardtype(board_t);
     static board_t _default_fallback_board(void);
     void _setup_i2c(board_t);
     void _setup_led(board_t);
diff --git a/src/M5Unified.inl b/src/M5Unified.inl
index dc3c987..0de5e30 100644
--- a/src/M5Unified.inl
+++ b/src/M5Unified.inl
@@ -1621,11 +1621,6 @@ static constexpr const uint8_t _pin_table_mbus[][31] = {
 #endif
   }
 
-  board_t M5Unified::_check_boardtype(board_t board)
-  {
-    return board;
-  }
-
   board_t M5Unified::_default_fallback_board(void)
   {
     // Build selection follows explicit fallback and detector candidates.