diff --git a/APP/app_log.c b/APP/app_log.c
index 76a62f7..c92c9cd 100644
--- a/APP/app_log.c
+++ b/APP/app_log.c
@@ -142,6 +142,11 @@ void app_log_write(char level, const char *cat, const char *fmt, ...)
     va_list ap;
     int n;
 
+    /* TMR6 1ms ISR 会经 AutoBand NoteOn 回调进来：禁止在中断里 take mutex / 打 RTT */
+    if (rt_interrupt_get_nest() != 0) {
+        return;
+    }
+
     if (level == 'D' && s_debug_level != 'D') {
         return;
     }
@@ -387,7 +392,7 @@ uint8_t app_log_try_command(const char *cmd)
         UI_ApplyToneAddress();
         AutoBandTop1_Stop();
         StartFlag = 0;
-        ret = AutoBandTop1_LoadPresetItemFromFlash(0);
+        ret = App_Auto_LoadPresetFromFlash(0);
         snprintf(line, sizeof(line),
                  "TONE_LOCAL ret=%d addr=0x%08lX map=BIN2@0x%08lX name=%s count=%d %s\n",
                  ret, (unsigned long)ADDRESS,
@@ -416,7 +421,7 @@ uint8_t app_log_try_command(const char *cmd)
         if (count > 0 && (int)idx >= count)
             idx = (unsigned)(count - 1);
         ParamGuiData[SONG_MODE_PARAM].Current = (uint8_t)idx;
-        ret = AutoBandTop1_LoadPresetItemFromFlash((int)idx);
+        ret = App_Auto_LoadPresetFromFlash((int)idx);
         snprintf(line, sizeof(line),
                  "TONE_BIN1 ret=%d idx=%u addr=0x%08lX map=BIN1@0x%08lX name=%s count=%d %s\n",
                  ret, idx, (unsigned long)ADDRESS,
@@ -445,7 +450,7 @@ uint8_t app_log_try_command(const char *cmd)
         if (count > 0 && (int)idx >= count)
             idx = (unsigned)(count - 1);
         ParamGuiData[EXPRESS_MODE_PARAM].Current = (uint8_t)idx;
-        ret = AutoBandTop1_LoadPresetItemFromFlash((int)idx);
+        ret = App_Auto_LoadPresetFromFlash((int)idx);
         snprintf(line, sizeof(line),
                  "TONE_BIN2 ret=%d idx=%u addr=0x%08lX map=BIN2@0x%08lX name=%s count=%d %s\n",
                  ret, idx, (unsigned long)ADDRESS,
@@ -474,7 +479,7 @@ uint8_t app_log_try_command(const char *cmd)
         if (count > 0 && (int)idx >= count)
             idx = (unsigned)(count - 1);
         ParamGuiData[ALL_MODE_PARAM].Current = (uint8_t)idx;
-        ret = AutoBandTop1_LoadPresetItemFromFlash((int)idx);
+        ret = App_Auto_LoadPresetFromFlash((int)idx);
         snprintf(line, sizeof(line),
                  "TONE_BIN3 ret=%d idx=%u addr=0x%08lX map=BIN3@0x%08lX name=%s count=%d %s\n",
                  ret, idx, (unsigned long)ADDRESS,
@@ -502,7 +507,7 @@ uint8_t app_log_try_command(const char *cmd)
             UI_ApplyToneAddress();
             AutoBandTop1_Stop();
             StartFlag = 0;
-            (void)AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
+            (void)App_Auto_LoadPresetFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
             KEY_ID_1629 = 0;
             PressFlag = 0;
             Pick_Handle();
diff --git a/Global/Global.c b/Global/Global.c
index 967a909..06656e9 100644
--- a/Global/Global.c
+++ b/Global/Global.c
@@ -101,7 +101,7 @@ int16_t MIC_VOL_MAP[11]= {-9000,-7000,-5000,-3000,-1000,1000,3000,5000,7000,9000
 
 uint8_t TOUCH_AREA_NUM = (sizeof(Touch_Areas)/sizeof(Touch_AreaTypeDef));
 
-const uint8_t Version[3] = {0,2,10}; /* major.minor.patch — 0.2.10: tone 0914 (BIN3 after 2.bin); autoclose label 关闭 */
+const uint8_t Version[3] = {0,2,11}; /* major.minor.patch — 0.2.11: power-key watchdog + refuse play on bad tone pack */
 
 uint8_t Led = 8;
 bool PressFlag = 0;
@@ -159,8 +159,9 @@ void BLTask_Sendmsg(uint16_t ID, uint16_t ID2, uint16_t HiByte, uint16_t LoByte)
 
 #define KEY_PRESS_LEVEL   RESET
 
-#define PWR_ON_HOLD_MS    3000   /* 关机态长按 3s → 开机 */
-#define PWR_OFF_HOLD_MS   2000   /* 开机态长按 2s → 关机 */
+#define PWR_ON_HOLD_MS       3000   /* 关机态长按 3s → 开机 */
+#define PWR_OFF_HOLD_MS      2000   /* 开机态长按 2s → 关机 */
+#define PWR_OFF_GRACE_MS     1500   /* 请求优雅关机后，超时仍未切轨则紧急断电+复位 */
 
 
 typedef enum
@@ -176,10 +177,37 @@ static uint32_t pwr_press_tick = 0;
 /* 当前开关机状态（UI_Idle.c 等 extern 引用） */
 bool powon = false;
 
+/* 电源轨是否已切断（优雅关机与紧急关机共用；ISR 依此判断是否还需强切） */
+static volatile uint8_t s_pwr_rails_cut = 0;
+/* TMR7：关机长按已触发请求后的紧急倒计时（ms） */
+static volatile uint16_t s_pwr_off_grace_ms = 0;
+
 /* ==================== 开机/关机动作 ==================== */
+
+/* 仅 GPIO/背光：可在 ISR / HardFault 中调用，禁止 RTOS/Flash/日志 */
+void PowerOff_CutRails(void)
+{
+  s_pwr_rails_cut = 1u;
+  powon = false;
+  LCD_BLK_Clr();
+  BSP_MainPowerEnable(0);
+  BSP_DreamCorePowerEnable(0);
+  BSP_HT7178PowerEnable(0);
+  BSP_BlueToothPowerEnable(0);
+}
+
+static void PowerOff_EmergencyReset(void)
+{
+  PowerOff_CutRails();
+  /* 主循环已死时无法画充电页：复位后按 USB 状态进充电/待机 */
+  nvic_system_reset();
+}
+
 void System_PowerOn(void)
 {
   LOG_I("PWR", "power_on begin");
+  s_pwr_rails_cut = 0u;
+  s_pwr_off_grace_ms = 0u;
   /* 控制电源硬件；蓝牙按 NVM/系统设置开关恢复，勿强制常开 */
   BSP_MainPowerEnable(1);
   BSP_DreamCorePowerEnable(1);
@@ -213,6 +241,7 @@ static void PowerOff(void)
 
   LOG_I("PWR", "power_off begin");
   powon = false;    /* 更新关机标志 */
+  s_pwr_off_grace_ms = 0u; /* 主路径已接管，取消紧急倒计时 */
   StopFullTask();
 
   /* 关机前把当前调音台推子与蓝牙开关写入 NVM，保证再次开机保持 */
@@ -234,13 +263,9 @@ static void PowerOff(void)
   app_tm1629_all_off();
 
   app_tm1617_off();
-  /* 关掉主电源/音源/功放/蓝牙；MCU 仍跑以便长按开机与 Type-C 检测 */
-  BSP_MainPowerEnable(0);
-  BSP_DreamCorePowerEnable(0);
-  BSP_HT7178PowerEnable(0);
-  /* BT 最后关：给已排队的 UART4 ACK（如 05 00）留出模组转发窗口 */
+  /* BT 先留窗口转发已排队 ACK，再切全部电源轨 */
   rt_thread_mdelay(30);
-  BSP_BlueToothPowerEnable(0);
+  PowerOff_CutRails();
   CurrUIProcress = IdleProcess;
   MainTask_Sendmsg(MSG_ID_POWER_OFF, 0, 0, 0);
   LOG_I("PWR", "power_off done (soft-off)");
@@ -271,6 +296,9 @@ static volatile uint8_t s_sys_poweroff_req = 0;
 void System_RequestPowerOff(void)
 {
   s_sys_poweroff_req = 1;
+  /* 主循环若已卡死：TMR7 紧急倒计时仍会强切电源 */
+  if (s_pwr_off_grace_ms == 0u && !s_pwr_rails_cut)
+    s_pwr_off_grace_ms = PWR_OFF_GRACE_MS;
 }
 void System_PowerOff_Poll(void)
 {
@@ -282,6 +310,77 @@ void System_PowerOff_Poll(void)
   }
 }
 
+/*
+ * TMR7 1ms（优先级高于伴奏 TMR6）：与主循环解耦的关机键扫描。
+ * 正常：请求优雅关机；超时未切轨 → 紧急断电并复位。
+ */
+void Power_Key_IsrTick(void)
+{
+  static uint16_t isr_hold_ms = 0;
+  static uint8_t  isr_fired = 0;
+  flag_status st = BSP_GetPowerKey();
+
+  if (st == KEY_PRESS_LEVEL)
+  {
+    if (isr_hold_ms < 60000u)
+      isr_hold_ms++;
+  }
+  else
+  {
+    isr_hold_ms = 0;
+    isr_fired = 0;
+  }
+
+  /* 仅处理「开机态关机」；开机仍由主循环负责（需完整外设初始化） */
+  if (powon && !isr_fired && isr_hold_ms >= PWR_OFF_HOLD_MS)
+  {
+    isr_fired = 1;
+    System_RequestPowerOff();
+  }
+
+  if (s_pwr_off_grace_ms > 0u)
+  {
+    s_pwr_off_grace_ms--;
+    if (s_pwr_off_grace_ms == 0u && !s_pwr_rails_cut)
+      PowerOff_EmergencyReset();
+  }
+}
+
+/* HardFault / MemManage / BusFault / UsageFault：死循环中仍可长按关机 */
+void Power_Key_FaultLoop(void)
+{
+  uint32_t hold = 0;
+  for (;;)
+  {
+    if (BSP_GetPowerKey() == KEY_PRESS_LEVEL)
+    {
+      hold++;
+      if (hold >= PWR_OFF_HOLD_MS)
+      {
+        PowerOff_EmergencyReset();
+      }
+    }
+    else
+    {
+      hold = 0;
+    }
+    Delay_us(1000);
+  }
+}
+
+static rt_err_t Power_HardFault_Hook(void *context)
+{
+  (void)context;
+  Power_Key_FaultLoop();
+  return -RT_ERROR; /* 不可达 */
+}
+
+void Power_Key_WatchdogInit(void)
+{
+  rt_hw_exception_install(Power_HardFault_Hook);
+  wk_tmr7_pwrkey_init();
+}
+
 void Power_Key_Scan()
 {
   flag_status status = BSP_GetPowerKey();
@@ -340,19 +439,13 @@ void Power_Key_Scan()
       }
       holdtick = now - pwr_press_tick;
 
-      /* 用 powon 区分：关机长按 3s 开机，开机长按 2s 关机 */
+      /* 关机长按 3s 开机；开机态关机改由 TMR7 ISR（主循环卡死仍可关） */
       if(powon == false && holdtick >= PWR_ON_HOLD_MS)
       {
         LOG_I("PWR", "key power_on hold=%u", (unsigned)holdtick);
         PowerOn();
         pwr_key_state = KEY_STATE_NONE;
       }
-      else if(powon == true && holdtick >= PWR_OFF_HOLD_MS)
-      {
-        LOG_I("PWR", "key power_off hold=%u", (unsigned)holdtick);
-        PowerOff();
-        pwr_key_state = KEY_STATE_NONE;
-      }
     break;
 
     case KEY_STATE_NONE:
@@ -814,6 +907,15 @@ void Pick_Handle()
   uint8_t note_cnt = 0;
   uint8_t chord_id = KEY_ID_1629;
 
+  /* 空库/加载失败时禁止起奏：否则 TMR6 ISR 内 AutoBand 可能 HardFault，
+   * LCD 卡死且主循环 Power_Key_Scan 不再跑 → 只能 RESET */
+  if (!App_Auto_IsPresetReady())
+  {
+    LOG_E("pick", "abort: preset not ready tab=%u addr=0x%08X",
+          (unsigned)mGuiData[GUI_TAB_INDEX].Current, (unsigned)ADDRESS);
+    return;
+  }
+
   /* 左手未触发和弦板（或落在拍速/停止键）时：拨片默认发当前调一级大和弦伴奏；
    * 普通模式除外——必须左手按住指板再拨，不做一级兜底 */
   if (mGuiData[GUI_TAB_INDEX].Current != 2 &&
diff --git a/Global/Global.h b/Global/Global.h
index 865acc5..ebdf71f 100644
--- a/Global/Global.h
+++ b/Global/Global.h
@@ -166,6 +166,10 @@ extern uint8_t  KEY_ID_1629;
 
 extern bool powon;
 void Power_Key_Scan(void);
+void Power_Key_IsrTick(void);
+void Power_Key_FaultLoop(void);
+void Power_Key_WatchdogInit(void);
+void PowerOff_CutRails(void);
 void AutoPowerOff_Scan(void);
 void System_PowerOn(void);
 void System_RequestPowerOff(void);
diff --git a/MyCode/App_Auto.c b/MyCode/App_Auto.c
index fbce757..5762bf1 100644
--- a/MyCode/App_Auto.c
+++ b/MyCode/App_Auto.c
@@ -416,6 +416,31 @@ static const char *ToneFlashMapBank(uint32_t abs)
 
 static uint32_t s_flash_rd_last_base = 0xFFFFFFFFu;
 static uint16_t s_flash_rd_log_cnt = 0;
+/* 最近一次 LoadPreset 是否成功；失败时禁止拨片起奏（防空库 + TMR6 ISR 崩） */
+static volatile uint8_t s_preset_ready = 0;
+
+int App_Auto_LoadPresetFromFlash(int presetIndex)
+{
+    int ret = AutoBandTop1_LoadPresetItemFromFlash(presetIndex);
+    if (ret == 0)
+    {
+        const char *name = AutoBandTop1_GetPresetName();
+        int count = AutoBandTop1_GetPresetItemCount();
+        s_preset_ready = (count > 0 && name != NULL && name[0] != '\0') ? 1u : 0u;
+    }
+    else
+    {
+        s_preset_ready = 0u;
+        AutoBandTop1_Stop();
+        StartFlag = 0;
+    }
+    return ret;
+}
+
+uint8_t App_Auto_IsPresetReady(void)
+{
+    return s_preset_ready;
+}
 
 static int Func_CallBack_ReadFlash(int address,int length,uint8_t* pOutput)
 {
@@ -468,7 +493,7 @@ void App_Auto_Init(void)
     AutoBandTop1_RegisterReadFlashCallback(Func_CallBack_ReadFlash);
     m_presetCount = AutoBandTop1_GetPresetItemCount();
 
-    int ret = AutoBandTop1_LoadPresetItemFromFlash(0);
+    int ret = App_Auto_LoadPresetFromFlash(0);
     if (ret != 0)
     {
         uint8_t hdr[16];
diff --git a/MyCode/App_Auto.h b/MyCode/App_Auto.h
index 493e433..29b923b 100644
--- a/MyCode/App_Auto.h
+++ b/MyCode/App_Auto.h
@@ -8,9 +8,14 @@
 #ifndef APP_AUTO_H_
 #define APP_AUTO_H_
 #include "mymidififo1.h"
+#include <stdint.h>
 
 extern void App_Auto_Init(void);
 
+/* 统一加载入口：记录成功/失败，失败时 Stop，避免空库起奏进 ISR 崩溃 */
+int App_Auto_LoadPresetFromFlash(int presetIndex);
+uint8_t App_Auto_IsPresetReady(void);
+
 extern MidiFifoSeq_t m_MidiSendFifo;
 
 #endif /* APP_AUTO_H_ */
diff --git a/UI/UI_SongMode.c b/UI/UI_SongMode.c
index c458ec5..b41ec5f 100644
--- a/UI/UI_SongMode.c
+++ b/UI/UI_SongMode.c
@@ -180,11 +180,11 @@ void Touch_Action(int8_t FLAG, uint8_t ID, uint8_t areaIndex,uint8_t value)
             UI_ApplyToneAddress();
             int ret = 0;
             if (tab == 0)
-                ret = AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
+                ret = App_Auto_LoadPresetFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
             else if (mGuiData[GUI_AUTOBAND_SW].Current)
-                ret = AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[EXPRESS_MODE_PARAM].Current);
+                ret = App_Auto_LoadPresetFromFlash(ParamGuiData[EXPRESS_MODE_PARAM].Current);
             else
-                ret = AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[SONG_MODE_PARAM].Current);
+                ret = App_Auto_LoadPresetFromFlash(ParamGuiData[SONG_MODE_PARAM].Current);
             if (ret != 0)
                 LOG_E("tone", "load preset failed tab=%d sw=%d ret=%d addr=0x%08X",
                       tab, mGuiData[GUI_AUTOBAND_SW].Current, ret, (unsigned)ADDRESS);
diff --git a/UI/UI_global.c b/UI/UI_global.c
index 8004ed9..8e7dd92 100644
--- a/UI/UI_global.c
+++ b/UI/UI_global.c
@@ -170,7 +170,7 @@ void UI_ReloadTonePreset(void)
     /* 万能：和弦走向 */
     if (mGuiData[GUI_TAB_INDEX].Current == 0)
     {
-        int ret = AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
+        int ret = App_Auto_LoadPresetFromFlash(ParamGuiData[ALL_MODE_PARAM].Current);
         if (ret != 0)
         {
             uint8_t hdr[16];
@@ -197,7 +197,7 @@ void UI_ReloadTonePreset(void)
         local->Max = (LOCAL_SONG_COUNT > 0) ? (uint16_t)(LOCAL_SONG_COUNT - 1) : 0;
         if (local->Current > local->Max)
             local->Current = local->Max;
-        int ret = AutoBandTop1_LoadPresetItemFromFlash(local->Current);
+        int ret = App_Auto_LoadPresetFromFlash(local->Current);
         if (ret != 0)
             LOG_E("tone", "load local song idx=%d failed ret=%d addr=0x%08X map=BIN2@0x%08X",
                   local->Current, ret, (unsigned)ADDRESS,
@@ -217,7 +217,7 @@ void UI_ReloadTonePreset(void)
         return;
     }
     {
-        int ret = AutoBandTop1_LoadPresetItemFromFlash(ParamGuiData[SONG_MODE_PARAM].Current);
+        int ret = App_Auto_LoadPresetFromFlash(ParamGuiData[SONG_MODE_PARAM].Current);
         LOG_I("tone", "load rhythm idx=%d ret=%d name=%s addr=0x%08X map=BIN1@0x%08X %s",
               ParamGuiData[SONG_MODE_PARAM].Current, ret,
               AutoBandTop1_GetPresetName() ? AutoBandTop1_GetPresetName() : "?",
diff --git a/project/inc/wk_system.h b/project/inc/wk_system.h
index 0d5e3d7..4644d3c 100644
--- a/project/inc/wk_system.h
+++ b/project/inc/wk_system.h
@@ -41,6 +41,9 @@ void wk_tmr6_1ms_init(void);
 void wk_tmr6_1ms_tick(void);
 uint32_t wk_tmr6_tick_get(void);
 
+/* TMR7 1ms：关机键看门狗（优先级高于 TMR6，主循环卡死仍可关） */
+void wk_tmr7_pwrkey_init(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/project/src/at32f403a_407_int.c b/project/src/at32f403a_407_int.c
index e7af26a..392707c 100644
--- a/project/src/at32f403a_407_int.c
+++ b/project/src/at32f403a_407_int.c
@@ -30,7 +30,9 @@
 
 /* private includes ----------------------------------------------------------*/
 /* add user code begin private includes */
-
+/* 关机键看门狗：与 Global.c 解耦声明，避免 int.c 拉全量 includes */
+void Power_Key_IsrTick(void);
+void Power_Key_FaultLoop(void);
 /* add user code end private includes */
 
 /* private typedef -----------------------------------------------------------*/
@@ -110,16 +112,7 @@ void NMI_Handler(void)
   */
 void MemManage_Handler(void)
 {
-  /* add user code begin MemoryManagement_IRQ 0 */
-
-  /* add user code end MemoryManagement_IRQ 0 */
-  /* go to infinite loop when memory manage exception occurs */
-  while (1)
-  {
-    /* add user code begin W1_MemoryManagement_IRQ 0 */
-
-    /* add user code end W1_MemoryManagement_IRQ 0 */
-  }
+  Power_Key_FaultLoop();
 }
 
 /**
@@ -129,16 +122,7 @@ void MemManage_Handler(void)
   */
 void BusFault_Handler(void)
 {
-  /* add user code begin BusFault_IRQ 0 */
-
-  /* add user code end BusFault_IRQ 0 */
-  /* go to infinite loop when bus fault exception occurs */
-  while (1)
-  {
-    /* add user code begin W1_BusFault_IRQ 0 */
-
-    /* add user code end W1_BusFault_IRQ 0 */
-  }
+  Power_Key_FaultLoop();
 }
 
 /**
@@ -148,16 +132,7 @@ void BusFault_Handler(void)
   */
 void UsageFault_Handler(void)
 {
-  /* add user code begin UsageFault_IRQ 0 */
-
-  /* add user code end UsageFault_IRQ 0 */
-  /* go to infinite loop when usage fault exception occurs */
-  while (1)
-  {
-    /* add user code begin W1_UsageFault_IRQ 0 */
-
-    /* add user code end W1_UsageFault_IRQ 0 */
-  }
+  Power_Key_FaultLoop();
 }
 
 /**
@@ -241,6 +216,15 @@ void TMR6_GLOBAL_IRQHandler(void)
   //rt_os_tick_callback();
 }
 
+/**
+  * @brief  TMR7：关机键看门狗（先于伴奏 TMR6 响应，主循环死锁仍可关）
+  */
+void TMR7_GLOBAL_IRQHandler(void)
+{
+  tmr_flag_clear(TMR7, TMR_OVF_FLAG);
+  Power_Key_IsrTick();
+}
+
 /* add user code begin 1 */
 
 /* add user code end 1 */
diff --git a/project/src/main.c b/project/src/main.c
index 783bc9d..81febac 100644
--- a/project/src/main.c
+++ b/project/src/main.c
@@ -88,6 +88,8 @@ int main(void)
   drv_nvm_init();
   TaskInit();
   timer_init();
+  /* 关机键看门狗：TMR7 + HardFault hook，与主循环/伴奏 ISR 解耦 */
+  Power_Key_WatchdogInit();
   InitMenuUI();
   BSP_HT7178PowerEnable (1);
   BSP_ChargerEnable(1);
diff --git a/project/src/wk_system.c b/project/src/wk_system.c
index 6a43d73..d71d446 100644
--- a/project/src/wk_system.c
+++ b/project/src/wk_system.c
@@ -174,3 +174,16 @@ void wk_tmr6_1ms_init(void)
   tmr_counter_enable(TMR6, TRUE);
 }
 
+/**
+  * @brief  TMR7 1ms：仅扫关机键（抢占优先级 1，高于 TMR6=5 / 伴奏库）
+  */
+void wk_tmr7_pwrkey_init(void)
+{
+  crm_periph_clock_enable(CRM_TMR7_PERIPH_CLOCK, TRUE);
+  tmr_base_init(TMR7, 999, 239);
+  tmr_flag_clear(TMR7, TMR_OVF_FLAG);
+  tmr_interrupt_enable(TMR7, TMR_OVF_INT, TRUE);
+  nvic_irq_enable(TMR7_GLOBAL_IRQn, 1, 0);
+  tmr_counter_enable(TMR7, TRUE);
+}
+
diff --git a/tools/publish_k1_release.py b/tools/publish_k1_release.py
index d5c684a..ad316dd 100644
--- a/tools/publish_k1_release.py
+++ b/tools/publish_k1_release.py
@@ -38,7 +38,7 @@ TONE_HDR = PROJ / "project" / "inc" / "ExtFlash_Tone_Addr.h"
 IAP_DIR = REPO / "升级" / "MCU主控升级"
 OUT_ROOT = REPO / "tools" / "out"
 
-FW_VER = "0.2.10"
+FW_VER = "0.2.11"
 UI0902_RES_BASE = 0x00100000
 BOOT_FLASH_ADDR = 0x08000000
 APP_FLASH_ADDR = 0x08008000
@@ -135,12 +135,11 @@ def main() -> None:
         raise SystemExit(f"missing Boot bin: {BOOT_BIN}")
     if not EXE_BIN.is_file():
         raise SystemExit(f"missing MCU bin: {EXE_BIN}")
-    if not TONE_BIN.is_file():
-        # fallback legacy alias written by packer
+    tone_bin = TONE_BIN
+    if not tone_bin.is_file():
         legacy = PROJ / "tools" / "out" / "extflash_tone_0903.bin"
         if legacy.is_file():
-            global TONE_BIN
-            TONE_BIN = legacy
+            tone_bin = legacy
         else:
             raise SystemExit(f"missing tone pack: {TONE_BIN} (run pack_extflash_tone_0903.py)")
     if not UI0902_BIN.is_file():
@@ -165,7 +164,7 @@ def main() -> None:
         shutil.rmtree(pkg)
     pkg.mkdir(parents=True)
 
-    tone_data = TONE_BIN.read_bytes()
+    tone_data = tone_bin.read_bytes()
     verify_tone_layout(tone_data)
     ui_data = UI0902_BIN.read_bytes()
     if len(ui_data) < 1024: