diff --git a/src/hw_config_rev4.c b/src/hw_config_rev4.c
index 0cd55f7..ced5838 100644
--- a/src/hw_config_rev4.c
+++ b/src/hw_config_rev4.c
@@ -203,12 +203,16 @@ HardwareDefinitionPtr detect_hardware(void) {
 //    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 //    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 //    GPIO_Init (GPIOB, &GPIO_InitStructure);
-
+    #define CPU_MODEL_GD32       (0x13030410)
+    
     const uint8_t state = GPIO_ReadInputDataBit (GPIOB, GPIO_Pin_7);
-    if (state == 0) {
+    if (*((volatile uint32_t *)0xE0042000) == CPU_MODEL_GD32) {
+        g_current_hardware = &HW3;
+    } else if(state == 0){
         g_current_hardware = &HW4;
-    } else{
+    }
+    else{
         g_current_hardware = &HW3;
     }
     return g_current_hardware;
-}
\ No newline at end of file
+}