diff --git a/APP/app_log.c b/APP/app_log.c
index 9ac8080..348715d 100644
--- a/APP/app_log.c
+++ b/APP/app_log.c
@@ -51,11 +51,9 @@ static void app_log_flash_flush_page(void)
     s_flash_remain -= s_flash_page_len;
     s_flash_page_len = 0U;
 
-    /* 扇区边界或结束时 ACK，主机据此节流 */
-    if ((s_flash_addr & 0xFFFU) == 0U || s_flash_remain == 0U) {
-        snprintf(ack, sizeof(ack), "FLASH_ACK %lu\n", (unsigned long)s_flash_addr);
-        SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, ack);
-    }
+    /* 每页 ACK，避免主机打爆 RTT 下行缓冲 */
+    snprintf(ack, sizeof(ack), "FLASH_ACK %lu\n", (unsigned long)s_flash_addr);
+    SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, ack);
 }
 
 static void app_log_flash_feed(const uint8_t *data, unsigned len)
@@ -266,6 +264,13 @@ uint8_t app_log_try_command(const char *cmd)
         app_log_flash_start(size);
         return 1U;
     }
+    if (strncmp(cmd, "ui boot", 7) == 0) {
+        LCD_BLK_Set();
+        LCD_WR_PIC_FROM_FLASH(0, 0, UI0902_BOOT_LOGO_W, UI0902_BOOT_LOGO_H,
+                              UI0902_BOOT_LOGO_ADDR);
+        SEGGER_RTT_WriteString(APP_LOG_RTT_CHANNEL, "UI_BOOT_OK\n");
+        return 1U;
+    }
     return 0U;
 }
 
diff --git a/UI/UI_Idle.c b/UI/UI_Idle.c
index cd05f8d..fbd3a97 100644
--- a/UI/UI_Idle.c
+++ b/UI/UI_Idle.c
@@ -181,8 +181,8 @@ void IdleProcess(DisplayTaskMessage_Type msg)
     {
         case MSG_ID_POWER_ON : 
             LCD_BLK_Set();
-            LCD_FillByColor(0, 0, 240, 320, WHITE);
-            LCD_WR_PIC_FROM_FLASH(40, 80, 168, 155, 0x00000000);
+            LCD_WR_PIC_FROM_FLASH(0, 0, UI0902_BOOT_LOGO_W, UI0902_BOOT_LOGO_H,
+                                  UI0902_BOOT_LOGO_ADDR);
             BSP_SelectAdcChannel(6);
             /* 让出 CPU，避免忙等卡住触摸/主循环线程 */
             rt_thread_mdelay(1000);
diff --git a/project/inc/UI0902_Res_Addr.h b/project/inc/UI0902_Res_Addr.h
index 61bd7da..3029131 100644
--- a/project/inc/UI0902_Res_Addr.h
+++ b/project/inc/UI0902_Res_Addr.h
@@ -276,7 +276,11 @@
 #define UI0902_TXT_RESTORE_CONFIRM_W     71
 #define UI0902_TXT_RESTORE_CONFIRM_H     14
 
-#define UI0902_BTN_CANCEL_BIG_ADDR  (UI0902_RES_BASE + 0x086000UL)  /* 11872 bytes */
+#define UI0902_BOOT_LOGO_ADDR  (UI0902_RES_BASE + 0x086000UL)  /* 153600 bytes */
+#define UI0902_BOOT_LOGO_W     240
+#define UI0902_BOOT_LOGO_H     320
+
+#define UI0902_BTN_CANCEL_BIG_ADDR  (UI0902_RES_BASE + 0x0AC000UL)  /* 11872 bytes */
 #define UI0902_BTN_CANCEL_BIG_W     106
 #define UI0902_BTN_CANCEL_BIG_H     56
 
diff --git a/tools/assets_0902/07_开机/开机界面-20.png b/tools/assets_0902/07_开机/开机界面-20.png
new file mode 100644
index 0000000..a7dd0ac
Binary files /dev/null and b/tools/assets_0902/07_开机/开机界面-20.png differ
diff --git a/tools/flash_ui0902_res.py b/tools/flash_ui0902_res.py
index d8294f7..0d88d16 100644
--- a/tools/flash_ui0902_res.py
+++ b/tools/flash_ui0902_res.py
@@ -91,9 +91,13 @@ def wait_for(jlink, marker: str, timeout_s: float = 30.0) -> str:
 def send_bytes(jlink, payload: bytes) -> None:
     off = 0
     while off < len(payload):
-        n = jlink.rtt_write(0, list(payload[off : off + 128]))
-        if n <= 0:
-            time.sleep(0.01)
+        try:
+            n = jlink.rtt_write(0, list(payload[off : off + 64]))
+        except Exception:
+            time.sleep(0.05)
+            continue
+        if n is None or n <= 0:
+            time.sleep(0.02)
             continue
         off += n
 
@@ -124,11 +128,9 @@ def main() -> None:
         _ = rtt_read_text(jlink, 0.3)
 
         if not args.no_reset:
-            # Hardware reset clears any stuck flash_mode from a previous attempt
             print("hardware reset...")
             jlink.reset(halt=False)
             time.sleep(3.5)
-            # RTT CB may move after reboot — re-find
             try:
                 jlink.rtt_stop()
             except Exception:
@@ -148,26 +150,23 @@ def main() -> None:
         print(log.strip().splitlines()[-1])
         time.sleep(0.2)
 
-        # Smaller chunks + brief pause so erase/write can keep up with RTT down-buffer
-        chunk = 128
+        chunk = 256
         sent = 0
         t0 = time.time()
-        send_bytes(jlink, data[0:256])
-        sent = 256
-        wait_for(jlink, "FLASH_RX", 20.0)
-        print("device receiving...")
+        receiving = False
         while sent < size:
             end = min(sent + chunk, size)
             send_bytes(jlink, data[sent:end])
             sent = end
-            if sent % 256 == 0:
-                time.sleep(0.002)
-            if sent % 4096 == 0 or sent == size:
-                log = wait_for(jlink, "FLASH_ACK", 60.0)
-                if "FLASH_UI0902_OK" in log:
-                    print(log.strip().splitlines()[-1])
-                    print("Done. Mode-select should redraw with new assets.")
-                    return
+            # 一页对应一次 ACK；FLASH_RX 可能夹在同一次读缓冲里，勿分两次 wait
+            log = wait_for(jlink, "FLASH_ACK", 60.0)
+            if (not receiving) and ("FLASH_RX" in log or "FLASH_ACK" in log):
+                receiving = True
+                print("device receiving...")
+            if "FLASH_UI0902_OK" in log:
+                print(log.strip().splitlines()[-1])
+                print("Done. Mode-select should redraw with new assets.")
+                return
             if sent % (64 * 1024) == 0 or sent == size:
                 elapsed = time.time() - t0
                 print(f"  {sent}/{size} ({100.0 * sent / size:.1f}%) {elapsed:.1f}s")
diff --git a/tools/gen_ui0902_assets.py b/tools/gen_ui0902_assets.py
index 21ecaee..544d63b 100644
--- a/tools/gen_ui0902_assets.py
+++ b/tools/gen_ui0902_assets.py
@@ -48,9 +48,26 @@ def rgba_to_rgb565(im):
                 r = (r * a) // 255
                 g = (g * a) // 255
                 b = (b * a) // 255
-                c = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
-                out[i] = (c >> 8) & 0xFF
-                out[i + 1] = c & 0xFF
+                v = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3)
+                out[i] = (v >> 8) & 0xFF
+                out[i + 1] = v & 0xFF
+            i += 2
+    return bytes(out), w, h
+
+
+def rgba_to_rgb565_opaque(im):
+    """Full-screen boot/charge: keep dark background pixels (no near-black punch-through)."""
+    im = im.convert("RGB")
+    px = im.load()
+    w, h = im.size
+    out = bytearray(w * h * 2)
+    i = 0
+    for y in range(h):
+        for x in range(w):
+            r, g, b = px[x, y]
+            v = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3)
+            out[i] = (v >> 8) & 0xFF
+            out[i + 1] = v & 0xFF
             i += 2
     return bytes(out), w, h
 
@@ -172,6 +189,8 @@ EXTERNAL = [
     ("TXT_RESTORE_V2",     "06_控件/文字/文字-25.png"),
     ("TXT_RESTORE_H",      "06_控件/文字/文字-26.png"),
     ("TXT_RESTORE_CONFIRM", "06_控件/文字/文字-27.png"),
+    # 整屏开机 Logo（避开旧 0x0 / 充电 0xCB70 区，挂在 ui0902 资源包末尾）
+    ("BOOT_LOGO", "07_开机/开机界面-20.png"),
 ]
 
 
@@ -209,7 +228,15 @@ def main():
         im = Image.open(SRC / rel)
         if name in ("ROW_UNIVERSAL_NOT", "ROW_UNIVERSAL_SEL", "ROW_NORMAL_NOT", "ROW_NORMAL_SEL", "ROW_EXPERT_NOT", "ROW_EXPERT_SEL"):
             im = im.resize(ROW_RESIZE, Image.LANCZOS)
-        data, w, h = rgba_to_rgb565(im)
+            data, w, h = rgba_to_rgb565(im)
+        elif name == "BOOT_LOGO":
+            if im.size[0] >= 241 and im.size[1] >= 321:
+                im = im.crop((0, 0, 240, 320))
+            elif im.size != (240, 320):
+                im = im.resize((240, 320), Image.LANCZOS)
+            data, w, h = rgba_to_rgb565_opaque(im)
+        else:
+            data, w, h = rgba_to_rgb565(im)
         entries[name] = (offset, w, h, len(data))
         blob += data
         pad = (-len(blob)) % ALIGN