diff --git a/firmware/cyd/VERSION.txt b/firmware/cyd/VERSION.txt
index 3684e55..fa31bdc 100644
--- a/firmware/cyd/VERSION.txt
+++ b/firmware/cyd/VERSION.txt
@@ -1,5 +1,5 @@
 name: CYD TF card + touch speaker (cyd)
-git: f2b14eb
+git: 4f41621
 date: 2026-10-17
 board: ESP32-2432S028R (ILI9341)
 features: TF/SD info, SoftSPI touch, GPIO26 speaker
@@ -12,5 +12,5 @@ offsets:
 sha256:
   bootloader.bin  3D234A7471F67B013686DABD4DEE7C1FA915C9928463616A94BC9297ACF1ABF8
   boot_app0.bin   F94C5D786A7A8FAB06AC5D10E33BF37711A6697636DC037559EA19CC410A17F0
-  firmware.bin    6A14D85F7466922C021B3288B7246987FD57DEC850741991C6E7671EA1BF7785
+  firmware.bin    2D2D76255F85D2EB2ABBF0E7B98F32AC39E0692E1BAC99FF79DFF3F0B211CB47
   partitions.bin  148B959CBFF1C38AA8E1D5C0BA9D612C54997B945E56A63F41223EEF650653A1
diff --git a/firmware/cyd/firmware.bin b/firmware/cyd/firmware.bin
index 73d21b7..7b4d47b 100644
Binary files a/firmware/cyd/firmware.bin and b/firmware/cyd/firmware.bin differ
diff --git a/src/touch.cpp b/src/touch.cpp
index 87002f6..d43b68a 100644
--- a/src/touch.cpp
+++ b/src/touch.cpp
@@ -4,8 +4,9 @@
 #include <Arduino.h>
 
 /**
- * SoftSPI XPT2046 → 物理 240x320 → 交给 LVGL ROTATION_270
- * RNT 标定区间 + rot2；红点用变换后 UI 坐标
+ * SoftSPI XPT2046
+ * BL↔TR 是矩形主对角线镜像（XY 对调），不是 180°（180° 会搞成 TL↔BR）。
+ * 先按 rot2 得到旧 UI，再做对角修正，反变换喂给 LVGL 270。
  */
 
 int16_t g_dbg_phys_x = -1;
@@ -48,6 +49,16 @@ static uint16_t xpt_read(uint8_t cmd) {
   return v;
 }
 
+static int16_t clampi(int32_t v, int32_t lo, int32_t hi) {
+  if (v < lo) {
+    return (int16_t)lo;
+  }
+  if (v > hi) {
+    return (int16_t)hi;
+  }
+  return (int16_t)v;
+}
+
 void touch_init() {
   pinMode(CYD_TOUCH_CS, OUTPUT);
   pinMode(CYD_TOUCH_CLK, OUTPUT);
@@ -56,7 +67,7 @@ void touch_init() {
   pinMode(CYD_TOUCH_IRQ, INPUT);
   digitalWrite(CYD_TOUCH_CS, HIGH);
   digitalWrite(CYD_TOUCH_CLK, LOW);
-  Serial.println("Touch: SoftSPI rot2 map 240x320");
+  Serial.println("Touch: SoftSPI + diagonal fix (BL/TR)");
 }
 
 void touch_read_cb(lv_indev_t * /*indev*/, lv_indev_data_t *data) {
@@ -75,45 +86,40 @@ void touch_read_cb(lv_indev_t * /*indev*/, lv_indev_data_t *data) {
     return;
   }
 
-  // setRotation(2)
   const int16_t p_x = (int16_t)adc_x;
   const int16_t p_y = (int16_t)(4095 - adc_y);
 
   int16_t x = map(p_x, 200, 3700, 1, SCREEN_WIDTH);
   int16_t y = map(p_y, 240, 3800, 1, SCREEN_HEIGHT);
+  x = clampi(x, 0, SCREEN_WIDTH - 1);
+  y = clampi(y, 0, SCREEN_HEIGHT - 1);
 
-  if (x < 0) {
-    x = 0;
-  }
-  if (y < 0) {
-    y = 0;
-  }
-  if (x >= SCREEN_WIDTH) {
-    x = SCREEN_WIDTH - 1;
-  }
-  if (y >= SCREEN_HEIGHT) {
-    y = SCREEN_HEIGHT - 1;
-  }
+  // 旧 UI（LVGL270）：(y, 239-x) — 该空间里 BL↔TR，做主对角线镜像
+  // (ux,uy) -> (uy*(319/239), ux*(239/319))
+  const int32_t old_ux = y;
+  const int32_t old_uy = (SCREEN_WIDTH - 1) - x;
+  int16_t ui_x = clampi((old_uy * (UI_HOR_RES - 1)) / (UI_VER_RES - 1), 0,
+                        UI_HOR_RES - 1);
+  int16_t ui_y = clampi((old_ux * (UI_VER_RES - 1)) / (UI_HOR_RES - 1), 0,
+                        UI_VER_RES - 1);
 
-  // BL↔TR 对角反了：物理坐标整体旋转 180°
-  x = (int16_t)((SCREEN_WIDTH - 1) - x);
-  y = (int16_t)((SCREEN_HEIGHT - 1) - y);
+  // 反变换喂 LVGL，使最终落在 (ui_x, ui_y)
+  const int16_t feed_x = (int16_t)((SCREEN_WIDTH - 1) - ui_y);
+  const int16_t feed_y = ui_x;
 
-  // LVGL 270 → UI
   g_dbg_phys_x = x;
   g_dbg_phys_y = y;
-  g_dbg_logic_x = y;
-  g_dbg_logic_y = (int16_t)((SCREEN_WIDTH - 1) - x);
+  g_dbg_logic_x = ui_x;
+  g_dbg_logic_y = ui_y;
   g_dbg_touch_down = true;
 
   static uint32_t last_log = 0;
   if (millis() - last_log > 80) {
     last_log = millis();
-    Serial.printf("Touch phys(%d,%d) UI(%d,%d)\n", x, y, g_dbg_logic_x,
-                  g_dbg_logic_y);
+    Serial.printf("Touch UI(%d,%d)\n", ui_x, ui_y);
   }
 
-  data->point.x = x;
-  data->point.y = y;
+  data->point.x = feed_x;
+  data->point.y = feed_y;
   data->state = LV_INDEV_STATE_PRESSED;
 }