diff --git a/patch_v2/meow_launcherd/meow_launcherd b/patch_v2/meow_launcherd/meow_launcherd
index 3f863fe..3f39389 100755
Binary files a/patch_v2/meow_launcherd/meow_launcherd and b/patch_v2/meow_launcherd/meow_launcherd differ
diff --git a/patch_v2/meow_launcherd/meow_settings.c b/patch_v2/meow_launcherd/meow_settings.c
index 5fe436e..7faa076 100644
--- a/patch_v2/meow_launcherd/meow_settings.c
+++ b/patch_v2/meow_launcherd/meow_settings.c
@@ -693,6 +693,24 @@ int meow_settings_save(void)
     }
     write_full_conf(fd);
     close(fd);
+    /* boot.default：除写 settings.conf 外，还要同步到启动菜单的权威文件 /data/meow_boot_default
+     * （bootmenu 开机读它定默认项；与 bootmenu set_boot_default_meow() 写 "0" / launcher
+     * set_boot_default_hiby() 写 "1" 同文件、同语义：meow=0(默认 MeowOS), hiby=1(默认 HiByOS)）。
+     * 幂等：值未变也 O_TRUNC 重写，无害。init 读入不触发 save，故不会反向覆盖权威文件。 */
+    meow_setting *bdef = find_set("boot.default");
+    if (bdef) {
+        int v = (!strcmp(bdef->cur, "hiby")) ? 1 : 0;   /* meow(默认) -> 0, hiby -> 1 */
+        int bf = open("/data/meow_boot_default", O_WRONLY | O_CREAT | O_TRUNC, 0644);
+        if (bf >= 0) {
+            char bb[8];
+            int n = snprintf(bb, sizeof bb, "%d\n", v);
+            write(bf, bb, n);
+            close(bf);
+            sset_log("boot.default=%s -> /data/meow_boot_default=%d", bdef->cur, v);
+        } else {
+            sset_log("boot.default sync: open /data/meow_boot_default fail: %s", strerror(errno));
+        }
+    }
     for (int i = 0; i < g_nsets; i++) g_sets[i].dirty = 0;
     return MEOW_OK;
 }