diff --git a/patch_v2/meow_launcherd/app_launcher.c b/patch_v2/meow_launcherd/app_launcher.c
index 58328a2..cb1523a 100644
--- a/patch_v2/meow_launcherd/app_launcher.c
+++ b/patch_v2/meow_launcherd/app_launcher.c
@@ -1301,6 +1301,16 @@ static int launch_app_chain(struct app *a, const char *chain)
              * 1=大字库GBK，2=Full。SDK meow_ui_gfx 读入存档并按档装载（见
              * meow_font_effective_paths_tiered；真正装载由 meow_font_reload_tier 实现）。 */
             int eff_tier = meow_font_effective_tier(a->fonts);
+            /* M2.85 内存护栏：大字库（gbk 驻留 ~17MB）在低内存时会连 App 一起被 OOM 杀
+             * （真机实测 ncm anon-rss 22MB 被 oom_kill）。MemAvailable 低于阈值 → 强制降 common，
+             * App 大字库需求让位于「能跑起来」（215 建议策略，launcher 层首选落点）。 */
+            if (eff_tier > MEOW_FONT_TIER_COMMON) {
+                long av = sys_mem_available_kb();
+                if (av >= 0 && av < 24 * 1024) {
+                    logmsg("launch: MemAvailable=%ldKB < 24MB, font tier %d -> common (OOM guard)", av, eff_tier);
+                    eff_tier = MEOW_FONT_TIER_COMMON;
+                }
+            }
             snprintf(env_tier, sizeof env_tier, "MEOW_FONT_TIER=%d", eff_tier);
             envp[ne++] = env_tier;
             have_global = (meow_font_effective_paths_tiered(eff_tier, fpng, sizeof fpng,
diff --git a/patch_v2/meow_launcherd/main_menu.c b/patch_v2/meow_launcherd/main_menu.c
index 6791401..3820b1b 100644
--- a/patch_v2/meow_launcherd/main_menu.c
+++ b/patch_v2/meow_launcherd/main_menu.c
@@ -385,17 +385,22 @@ static void menu_name_fit(const char *name, int maxw, int size, char *out, int o
     snprintf(out, olen, "%s...", buf);
 }
 
-/* 图标绘制：有图 meow_ui_img_cover（居中裁方）；无图 → 主题色圆角块 + 首字母。 */
+/* 图标绘制：primary 圆角垫块始终垫底（MD3 图标 tile），首字母叠加其上，最后有图叠加
+ * meow_ui_img_cover（居中裁方）。
+ * 修复：原实现 `if (icon) { meow_ui_img_cover; return; }` 在图标为透明背景 logo（不透明像素
+ * 极少/无）时整区只剩卡面，且因 icon!=NULL 完全跳过占位 →「图标区+首字母占位都不见了」。
+ * 现让垫块+首字母先画：不透明/方图盖住它们（观感=纯图）；透明图则露出垫块+首字母（占位）。
+ * 图标区任何情况下都非空，且首字母占位不再被图标句柄吞掉。 */
 static void menu_draw_icon(const struct app *a, meow_img *icon, int x, int y, int sz,
                            const meow_ui_theme_t *th)
 {
-    if (icon) { meow_ui_img_cover(x, y, sz, icon); return; }
     meow_gfx_fill_round(x, y, sz, sz, sz * 3 / 10, th->primary);
     char g[4];
     menu_first_glyph(a->name, g);
     uint32_t fg = menu_contrast(th->primary);
     int cw = ui_width(g, 20);
     ui_draw(x + sz / 2 - cw / 2, y + sz / 2 - meow_font_line_height(20) / 2, g, fg, 20);
+    if (icon) { meow_ui_img_cover(x, y, sz, icon); }
 }
 
 /* 应用格几何（grid/list 统一入口；供 draw 与 touch 命中共用）。 */
diff --git a/patch_v2/meow_launcherd/meow_launcher_internal.h b/patch_v2/meow_launcherd/meow_launcher_internal.h
index b794f75..0734b85 100644
--- a/patch_v2/meow_launcherd/meow_launcher_internal.h
+++ b/patch_v2/meow_launcherd/meow_launcher_internal.h
@@ -553,6 +553,8 @@ extern int log_fd;
 extern char log_file[256];
 /* M2.x 应用日志目录简化（apps/<id>/logs → <id>）：mkdir -p 幂等；迁移用。 */
 int meow_mkdir_p(const char *path);
+/* M2.85 内存护栏：/proc/meminfo MemAvailable（kB）；失败 -1（util.c）。 */
+long sys_mem_available_kb(void);
 extern uint32_t menu_bg;
 extern int menu_opened_blank;
 extern int meow_auto_slept;
diff --git a/patch_v2/meow_launcherd/meow_launcherd b/patch_v2/meow_launcherd/meow_launcherd
index 5bfa89d..eb4ffc2 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/test_host_icon b/patch_v2/meow_launcherd/test_host_icon
new file mode 100755
index 0000000..c91ad69
Binary files /dev/null and b/patch_v2/meow_launcherd/test_host_icon differ
diff --git a/patch_v2/meow_launcherd/test_host_icon.c b/patch_v2/meow_launcherd/test_host_icon.c
new file mode 100644
index 0000000..a8a24e2
--- /dev/null
+++ b/patch_v2/meow_launcherd/test_host_icon.c
@@ -0,0 +1,158 @@
+/* test_host_icon.c — 宿主最小 harness：复现主界面卡片（menu_draw_grid_cell）的
+ * 「卡底 → 图标 → 名称」绘制序列（与实际菜单同序），断言图标区像素非空。
+ *
+ * 背景：真机「应用图标完全不渲染（连首字母占位都无）」。本 harness 用真实 SDK（gfx+img）
+ * 按实际调用顺序绘制，对「有图（meow_ui_img_cover 不透明 226×226）」与「无图（primary
+ * 圆角块占位）」两分支各断言图标区含非背景像素；另转 PPM 目检。
+ *
+ * 编译（在 patch_v2/meow_launcherd 下）：
+ *   gcc -o test_host_icon test_host_icon.c ../sdk/test_host_stub.c \
+ *       ../sdk/meow_ui_gfx.c ../sdk/meow_ui_sys.c ../sdk/meow_ui_theme.c \
+ *       ../sdk/meow_ui_vol.c ../sdk/meow_ui_log.c ../sdk/meow_ui_widget.c \
+ *       ../sdk/meow_ui_input.c ../sdk/meow_ui_activity.c ../sdk/meow_ui_dialog.c \
+ *       ../sdk/meow_ui_ime.c ../sdk/meow_ui_draw.c ../sdk/meow_ui_view.c \
+ *       ../sdk/meow_ui_img.c ../sdk/meow_notify_ipc.c ../sdk/meow_ui_media.c \
+ *       ../sdk/stb_image.c -I../sdk -I. -DMEOW_UI_HOST_TEST -pthread -lm
+ * 运行：MEOW_UI_DUMP=/tmp/icon.ppm ./test_host_icon
+ */
+#include "meow_ui.h"
+#include "meow_ui_internal.h"   /* meow_ui_back_buf/pitch/bpp + meow_gfx_fill_round */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+/* 与 launcher 主题色（dark）对齐 */
+#define TH_SURFACE_CONTAINER 0x263038
+#define TH_PRIMARY           0x4A6A9A
+/* 不透明图标填充色 */
+#define IMG_COLOR            0x336699
+
+/* 与主菜单一致的几何常量（main_menu.c） */
+#define MENU_GRID_RADIUS 16
+#define MENU_GRID_ICON   44
+#define MENU_GRID_CARD_H 112
+#define MENU_GRID_COLS   2
+#define MENU_GRID_PAD    12
+#define MENU_GRID_GAP    10
+#define FB_W 480
+#define FB_H 720
+
+static void rd_px(int x, int y, int *r, int *g, int *b)
+{
+    unsigned char *bb = meow_ui_back_buf();
+    int line = meow_ui_back_buf_pitch(), bpp = meow_ui_back_buf_bpp();
+    if (!bb || x < 0 || y < 0) { *r = *g = *b = 0; return; }
+    if (bpp == 16) {
+        uint16_t px = *(uint16_t *)(bb + (size_t)y * line + (size_t)x * 2);
+        *r = (((px >> 11) & 0x1F) << 3) | ((px >> 11) & 0x1F) >> 2;
+        *g = (((px >> 5) & 0x3F) << 2) | ((px >> 5) & 0x3F) >> 4;
+        *b = ((px & 0x1F) << 3) | ((px & 0x1F) >> 2);
+    } else {
+        uint32_t px = *(uint32_t *)(bb + (size_t)y * line + (size_t)x * 4);
+        *r = (px >> 16) & 0xFF; *g = (px >> 8) & 0xFF; *b = px & 0xFF;
+    }
+}
+static int near2(int a, int b) { int d = a - b; if (d < 0) d = -d; return d <= 16; }
+static int px_near(int x, int y, int r, int g, int b)
+{
+    int rr, gg, bb; rd_px(x, y, &rr, &gg, &bb);
+    return near2(rr, r) && near2(gg, g) && near2(bb, b);
+}
+/* 区域内含「接近 target 色」的像素数 */
+static int region_has(int x, int y, int w, int h, int r, int g, int b)
+{
+    int cnt = 0;
+    for (int dy = 0; dy < h; dy++)
+        for (int dx = 0; dx < w; dx++)
+            if (px_near(x + dx, y + dy, r, g, b)) cnt++;
+    return cnt;
+}
+#define UNPK(c, rr, gg, bb) do { (rr) = ((c) >> 16) & 0xFF; (gg) = ((c) >> 8) & 0xFF; (bb) = (c) & 0xFF; } while (0)
+
+/* 菜单图标绘制（menu_draw_icon）：primary 圆角垫块始终垫底（MD3 图标 tile），
+ * 有图叠加 meow_ui_img_cover；无图叠加首字母。透明显图时垫块仍露出，图标区绝不空白。 */
+static void menu_draw_icon_like(meow_img *icon, int x, int y, int sz)
+{
+    meow_gfx_fill_round(x, y, sz, sz, sz * 3 / 10, TH_PRIMARY);
+    if (icon) { meow_ui_img_cover(x, y, sz, icon); return; }
+}
+
+/* 复现 menu_draw_grid_cell 的绘制序列（卡底 → 图标；名称与图标区隔离，无关像素） */
+static void draw_grid_cell(int x, int y, int w, int h, meow_img *icon)
+{
+    meow_gfx_fill_round(x, y, w, h, MENU_GRID_RADIUS, TH_SURFACE_CONTAINER);
+    int sz = (h > MENU_GRID_ICON + 40) ? MENU_GRID_ICON : h - 40;
+    int icx = x + (w - sz) / 2, icy = y + 12;
+    menu_draw_icon_like(icon, icx, icy, sz);
+}
+
+int main(void)
+{
+    setbuf(stdout, NULL);   /* 立即冲刷，abort 前也能看到 printf */
+    setenv("MEOW_UI_DUMP", "/tmp/icon.ppm", 1);
+    meow_ui_opts o = { FB_W, FB_H };
+    assert(meow_ui_init(&o) == 0);
+    assert(meow_ui_width() == FB_W && meow_ui_height() == FB_H);
+
+    int apps_top = 130;   /* 模拟主菜单 app 区顶缘 */
+    int cx = MENU_GRID_PAD, cy = apps_top;
+    int cw = (FB_W - 2 * MENU_GRID_PAD - (MENU_GRID_COLS - 1) * MENU_GRID_GAP) / MENU_GRID_COLS;
+    int ch = MENU_GRID_CARD_H;
+    int sz = (ch > MENU_GRID_ICON + 40) ? MENU_GRID_ICON : ch - 40;
+    int icx = cx + (cw - sz) / 2, icy = cy + 12;
+
+    /* ---------- 分支 A：有图（meow_ui_img_cover，不透明 226×226，meow_img_load_file） ---------- */
+    {
+        meow_img *im = meow_img_load_file("/tmp/icon226.png");
+        assert(im != NULL);
+        assert(meow_img_w(im) == 226 && meow_img_h(im) == 226);
+
+        meow_ui_clear(0x000000);
+        draw_grid_cell(cx, cy, cw, ch, im);
+
+        int tr, tg, tb; UNPK(IMG_COLOR, tr, tg, tb);
+        int got = region_has(icx, icy, sz, sz, tr, tg, tb);
+        printf("A(image 226x226 opaque): icon region(%d,%d %dx%d) img-color px = %d\n",
+               icx, icy, sz, sz, got);
+        assert(got > 0 && "meow_ui_img_cover 未能把不透明图标画进图标区");
+
+        int sr, sg, sb; UNPK(TH_SURFACE_CONTAINER, sr, sg, sb);
+        int cardpx = region_has(icx, icy, sz, sz, sr, sg, sb);
+        printf("  card-color px inside icon region = %d\n", cardpx);
+        assert(cardpx == 0 && "图标区仍被卡底色占据（图标被盖掉/未画出）");
+        meow_img_free(im);
+    }
+
+    /* ---------- 分支 A'：全透明图标（alpha=0）——修复后垫块垫底，图标区非空 ---------- */
+    {
+        meow_img *im = meow_img_load_file("/tmp/icon226_trans.png");
+        assert(im != NULL);
+        meow_ui_clear(0x000000);
+        draw_grid_cell(cx, cy, cw, ch, im);
+        int pr, pg, pb; UNPK(TH_PRIMARY, pr, pg, pb);
+        int got = region_has(icx, icy, sz, sz, pr, pg, pb);
+        printf("A'(transparent icon, fixed): icon region primary(tile) px = %d\n", got);
+        assert(got > 0 && "全透明图标不再被放过：垫块应画出（图标区非空）");
+        /* 垫块圆角角落会透出卡底色，属几何本性 */
+        meow_img_free(im);
+    }
+
+    /* ---------- 分支 B：无图（primary 圆角块占位） ---------- */
+    {
+        meow_ui_clear(0x000000);
+        draw_grid_cell(cx, cy, cw, ch, NULL);
+        int pr, pg, pb; UNPK(TH_PRIMARY, pr, pg, pb);
+        int got = region_has(icx, icy, sz, sz, pr, pg, pb);
+        printf("B(placeholder primary round): icon region primary px = %d\n", got);
+        assert(got > 0 && "占位圆角块未画进图标区");
+        /* 圆角块角落会透出卡底色——这是几何本性，非 bug；只要求主色像素显著多 */
+        int sr, sg, sb; UNPK(TH_SURFACE_CONTAINER, sr, sg, sb);
+        int cardpx = region_has(icx, icy, sz, sz, sr, sg, sb);
+        printf("  card-color px in icon region (round corners) = %d\n", cardpx);
+        assert(got > sz * sz * 3 / 4 && "占位圆角块覆盖面积过小（未真正画到图标区）");
+    }
+
+    printf("PASS test_host_icon (A image + B placeholder render in icon region)\n");
+    return 0;
+}
diff --git a/patch_v2/meow_launcherd/util.c b/patch_v2/meow_launcherd/util.c
index 606f08c..5a129d9 100644
--- a/patch_v2/meow_launcherd/util.c
+++ b/patch_v2/meow_launcherd/util.c
@@ -12,6 +12,22 @@ char log_dir[256] = "";      /* "MeowOS/logs" on card, or "" */
 char log_file[256] = "";     /* full path of the boot log file */
 
 
+/* M2.85 内存护栏：读 /proc/meminfo 的 MemAvailable（kB）。失败返回 -1。
+ * 供 launcher 在低内存时对大字库请求降档（OOM 防线）。 */
+long sys_mem_available_kb(void)
+{
+    FILE *f = fopen("/proc/meminfo", "r");
+    if (!f) return -1;
+    char line[256];
+    long kb = -1;
+    while (fgets(line, sizeof line, f)) {
+        if (sscanf(line, "MemAvailable: %ld kB", &kb) == 1) break;
+    }
+    fclose(f);
+    return kb;
+}
+
+
 static int card_available(void)
 {
     /* TF card mounted? */