diff --git a/Production/Firmware/iidx_pico.uf2 b/Production/Firmware/iidx_pico.uf2
index fd24782..e140d50 100644
Binary files a/Production/Firmware/iidx_pico.uf2 and b/Production/Firmware/iidx_pico.uf2 differ
diff --git a/doc/Firmware_manual.pptx b/doc/Firmware_manual.pptx
index 2187df5..3d2fd13 100644
Binary files a/doc/Firmware_manual.pptx and b/doc/Firmware_manual.pptx differ
diff --git a/firmware/src/config.h b/firmware/src/config.h
index 6f3019f..2f12e49 100644
--- a/firmware/src/config.h
+++ b/firmware/src/config.h
@@ -37,6 +37,7 @@ typedef struct __attribute ((packed)) {
         uint8_t e3;
         uint8_t e4;
     } effects;
+    bool konami; /* konami spoof */
 } iidx_cfg_t;
 
 extern iidx_cfg_t *iidx_cfg;
diff --git a/firmware/src/main.c b/firmware/src/main.c
index 54ea01f..d7c164b 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -57,6 +57,24 @@ void boot_check()
     }
 }
 
+void mode_check()
+{
+    uint16_t key1 = (1 << (button_num() - 1));
+    uint16_t key2 = (1 << (button_num() - 2));
+    uint16_t buttons = button_read();
+    if (buttons & key1) {
+        iidx_cfg->konami = true;
+        save_request();
+    } else if (buttons & key2) {
+        iidx_cfg->konami = false;
+        save_request();
+    }
+
+    if (iidx_cfg->konami) {
+        konami_mode();
+    }
+}
+
 static bool request_core1_pause = false;
 
 static void pause_core1(bool pause)
@@ -132,6 +150,8 @@ void init()
     setup_init();
     config_init();
     save_init(pause_core1);
+
+    mode_check();
 }
 
 int main(void)
diff --git a/firmware/src/usb_descriptors.c b/firmware/src/usb_descriptors.c
index d813e04..203f61e 100644
--- a/firmware/src/usb_descriptors.c
+++ b/firmware/src/usb_descriptors.c
@@ -42,7 +42,7 @@
 //--------------------------------------------------------------------+
 // Device Descriptors
 //--------------------------------------------------------------------+
-tusb_desc_device_t const desc_device_joy = {
+tusb_desc_device_t desc_device_joy = {
     .bLength = sizeof(tusb_desc_device_t),
     .bDescriptorType = TUSB_DESC_DEVICE,
     .bcdUSB = 0x0200,
@@ -127,7 +127,7 @@ uint8_t const* tud_descriptor_configuration_cb(uint8_t index) {
 //--------------------------------------------------------------------+
 
 // array of pointer to string descriptors
-char const* string_desc_arr[] = {
+const char *string_desc_arr[] = {
     (const char[]){0x09, 0x04},  // 0: is supported language is English (0x0409)
     "WHowe"       ,              // 1: Manufacturer
     "Pico IIDX Controller",      // 2: Product
@@ -185,3 +185,11 @@ uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
 
   return _desc_str;
 }
+
+void konami_mode()
+{
+    desc_device_joy.idVendor = 0x1ccf;
+    desc_device_joy.idProduct = 0x8048;
+    string_desc_arr[1] = "Konami Amusement";
+    string_desc_arr[2] = "beatmania IIDX controller premium model";
+}
diff --git a/firmware/src/usb_descriptors.h b/firmware/src/usb_descriptors.h
index a6efd8d..c6021d8 100644
--- a/firmware/src/usb_descriptors.h
+++ b/firmware/src/usb_descriptors.h
@@ -64,4 +64,8 @@ enum {
       HID_USAGE_PAGE(HID_USAGE_PAGE_KEYBOARD), HID_USAGE_MIN(0),              \
       HID_USAGE_MAX(31 * 8 - 1), HID_INPUT(HID_VARIABLE), HID_COLLECTION_END
 
+
+/* Enable Konami spoof mode */
+void konami_mode();
+
 #endif /* USB_DESCRIPTORS_H_ */
\ No newline at end of file