diff --git a/Makefile b/Makefile
index cc371e3..b4a3b29 100644
--- a/Makefile
+++ b/Makefile
@@ -1,90 +1,109 @@
-rwildcard = $(foreach d, $(wildcard $1*), $(filter $(subst *, %, $2), $d) $(call rwildcard, $d/, $2))
-
-ifeq ($(strip $(DEVKITARM)),)
-$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
-endif
-
-include $(DEVKITARM)/base_rules
-
-################################################################################
-
-IPL_LOAD_ADDR := 0x40008000
-VERSION := $(shell cat VERSION)
-
-################################################################################
-
-TARGET := omninx-installer
-OUTPUT_NAME := OmniNX-Installer.bin
-BUILDDIR := build
-OUTPUTDIR := output
-SOURCEDIR := source
-BDKDIR := bdk
-BDKINC := -I./$(BDKDIR)
-VPATH = $(dir ./$(SOURCEDIR)/) $(dir $(wildcard ./$(SOURCEDIR)/*/)) $(dir $(wildcard ./$(SOURCEDIR)/*/*/))
-VPATH += $(dir $(wildcard ./$(BDKDIR)/)) $(dir $(wildcard ./$(BDKDIR)/*/)) $(dir $(wildcard ./$(BDKDIR)/*/*/))
-
-# All source files
-OBJS = $(patsubst $(SOURCEDIR)/%.S, $(BUILDDIR)/$(TARGET)/%.o, \
-		$(patsubst $(SOURCEDIR)/%.c, $(BUILDDIR)/$(TARGET)/%.o, \
-		$(call rwildcard, $(SOURCEDIR), *.S *.c)))
-OBJS += $(patsubst $(BDKDIR)/%.S, $(BUILDDIR)/$(TARGET)/%.o, \
-		$(patsubst $(BDKDIR)/%.c, $(BUILDDIR)/$(TARGET)/%.o, \
-		$(call rwildcard, $(BDKDIR), *.S *.c)))
-
-GFX_INC   := '"../$(SOURCEDIR)/gfx.h"'
-FFCFG_INC := '"../$(SOURCEDIR)/libs/fatfs/ffconf.h"'
-
-################################################################################
-
-CUSTOMDEFINES := -DIPL_LOAD_ADDR=$(IPL_LOAD_ADDR)
-CUSTOMDEFINES += -DGFX_INC=$(GFX_INC) -DFFCFG_INC=$(FFCFG_INC)
-CUSTOMDEFINES += -DVERSION='"$(VERSION)"'
-
-ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
-CFLAGS = $(ARCH) -Os -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11 -Wall -Wno-missing-braces $(CUSTOMDEFINES)
-LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections -Xlinker --defsym=IPL_LOAD_ADDR=$(IPL_LOAD_ADDR)
-
-################################################################################
-
-.PHONY: all clean release
-
-all: $(OUTPUTDIR)/$(OUTPUT_NAME)
-	$(eval BIN_SIZE = $(shell wc -c < $(OUTPUTDIR)/$(OUTPUT_NAME)))
-	@echo "Payload size is $(BIN_SIZE) bytes"
-	@echo "Max size is 126296 bytes."
-
-clean:
-	@rm -rf $(BUILDDIR)
-	@rm -rf $(OUTPUTDIR)
-	@rm -rf release
-	@rm -f $(TARGET)-*.zip
-
-$(OUTPUTDIR)/$(OUTPUT_NAME): $(BUILDDIR)/$(TARGET)/$(TARGET).elf
-	@mkdir -p "$(@D)"
-	$(OBJCOPY) -S -O binary $< $(OUTPUTDIR)/$(TARGET).bin
-	@mv $(OUTPUTDIR)/$(TARGET).bin $(OUTPUTDIR)/$(OUTPUT_NAME)
-
-$(BUILDDIR)/$(TARGET)/$(TARGET).elf: $(OBJS)
-	$(CC) $(LDFLAGS) -T $(SOURCEDIR)/link.ld $^ -o $@
-
-$(BUILDDIR)/$(TARGET)/%.o: $(SOURCEDIR)/%.c
-	@mkdir -p "$(@D)"
-	$(CC) $(CFLAGS) $(BDKINC) -I$(SOURCEDIR) -c $< -o $@
-
-$(BUILDDIR)/$(TARGET)/%.o: $(SOURCEDIR)/%.S
-	@mkdir -p "$(@D)"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(BUILDDIR)/$(TARGET)/%.o: $(BDKDIR)/%.c
-	@mkdir -p "$(@D)"
-	$(CC) $(CFLAGS) $(BDKINC) -I$(SOURCEDIR) -c $< -o $@
-
-$(BUILDDIR)/$(TARGET)/%.o: $(BDKDIR)/%.S
-	@mkdir -p "$(@D)"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-release: $(OUTPUTDIR)/$(OUTPUT_NAME)
-	@mkdir -p release/bootloader/payloads
-	@cp $(OUTPUTDIR)/$(OUTPUT_NAME) release/bootloader/payloads/$(OUTPUT_NAME)
-	@cd release && zip -r ../$(TARGET)-$(VERSION).zip bootloader
-	@echo "Release package created: $(TARGET)-$(VERSION).zip"
+rwildcard = $(foreach d, $(wildcard $1*), $(filter $(subst *, %, $2), $d) $(call rwildcard, $d/, $2))
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/base_rules
+
+################################################################################
+
+IPL_LOAD_ADDR := 0x40008000
+VERSION := $(shell cat VERSION)
+
+################################################################################
+
+TARGET := omninx-installer
+OUTPUT_NAME := OmniNX-Installer.bin
+BUILDDIR := build
+OUTPUTDIR := output
+SOURCEDIR := source
+BDKDIR := bdk
+BDKINC := -I./$(BDKDIR)
+VPATH = $(dir ./$(SOURCEDIR)/) $(dir $(wildcard ./$(SOURCEDIR)/*/)) $(dir $(wildcard ./$(SOURCEDIR)/*/*/))
+VPATH += $(dir $(wildcard ./$(BDKDIR)/)) $(dir $(wildcard ./$(BDKDIR)/*/)) $(dir $(wildcard ./$(BDKDIR)/*/*/))
+
+# All source files
+OBJS = $(patsubst $(SOURCEDIR)/%.S, $(BUILDDIR)/$(TARGET)/%.o, \
+		$(patsubst $(SOURCEDIR)/%.c, $(BUILDDIR)/$(TARGET)/%.o, \
+		$(call rwildcard, $(SOURCEDIR), *.S *.c)))
+OBJS += $(patsubst $(BDKDIR)/%.S, $(BUILDDIR)/$(TARGET)/%.o, \
+		$(patsubst $(BDKDIR)/%.c, $(BUILDDIR)/$(TARGET)/%.o, \
+		$(call rwildcard, $(BDKDIR), *.S *.c)))
+
+GFX_INC   := '"../$(SOURCEDIR)/gfx.h"'
+FFCFG_INC := '"../$(SOURCEDIR)/libs/fatfs/ffconf.h"'
+
+################################################################################
+
+CUSTOMDEFINES := -DIPL_LOAD_ADDR=$(IPL_LOAD_ADDR)
+CUSTOMDEFINES += -DGFX_INC=$(GFX_INC) -DFFCFG_INC=$(FFCFG_INC)
+CUSTOMDEFINES += -DVERSION='"$(VERSION)"'
+
+ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
+CFLAGS = $(ARCH) -Os -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11 -Wall -Wno-missing-braces $(CUSTOMDEFINES)
+LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections -Xlinker --defsym=IPL_LOAD_ADDR=$(IPL_LOAD_ADDR)
+
+################################################################################
+
+RAMTEST_BIN := $(OUTPUTDIR)/RAM-Test.bin
+OBJS_RAMTEST := $(filter-out $(BUILDDIR)/$(TARGET)/main.o,$(OBJS)) \
+	$(BUILDDIR)/$(TARGET)/ram_test_main.o
+
+.PHONY: all clean release ram-test
+
+all: $(OUTPUTDIR)/$(OUTPUT_NAME)
+	$(eval BIN_SIZE = $(shell wc -c < $(OUTPUTDIR)/$(OUTPUT_NAME)))
+	@echo "Payload size is $(BIN_SIZE) bytes"
+	@echo "Max size is 126296 bytes."
+
+clean:
+	@rm -rf $(BUILDDIR)
+	@rm -rf $(OUTPUTDIR)
+	@rm -f $(RAMTEST_BIN)
+	@rm -rf release
+	@rm -f $(TARGET)-*.zip
+
+$(OUTPUTDIR)/$(OUTPUT_NAME): $(BUILDDIR)/$(TARGET)/$(TARGET).elf
+	@mkdir -p "$(@D)"
+	$(OBJCOPY) -S -O binary $< $(OUTPUTDIR)/$(TARGET).bin
+	@mv $(OUTPUTDIR)/$(TARGET).bin $(OUTPUTDIR)/$(OUTPUT_NAME)
+
+$(BUILDDIR)/$(TARGET)/$(TARGET).elf: $(OBJS)
+	$(CC) $(LDFLAGS) -T $(SOURCEDIR)/link.ld $^ -o $@
+
+$(BUILDDIR)/$(TARGET)/ram_test_main.o: tools/ram_test_main.c
+	@mkdir -p "$(@D)"
+	$(CC) $(CFLAGS) $(BDKINC) -I$(SOURCEDIR) -c $< -o $@
+
+$(BUILDDIR)/$(TARGET)/ram_test.elf: $(OBJS_RAMTEST)
+	$(CC) $(LDFLAGS) -T $(SOURCEDIR)/link.ld $^ -o $@
+
+$(RAMTEST_BIN): $(BUILDDIR)/$(TARGET)/ram_test.elf
+	@mkdir -p "$(@D)"
+	$(OBJCOPY) -S -O binary $< $@
+	@echo "RAM-Test payload: $(RAMTEST_BIN) ($$(wc -c < $@) bytes)"
+
+ram-test: $(RAMTEST_BIN)
+
+$(BUILDDIR)/$(TARGET)/%.o: $(SOURCEDIR)/%.c
+	@mkdir -p "$(@D)"
+	$(CC) $(CFLAGS) $(BDKINC) -I$(SOURCEDIR) -c $< -o $@
+
+$(BUILDDIR)/$(TARGET)/%.o: $(SOURCEDIR)/%.S
+	@mkdir -p "$(@D)"
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILDDIR)/$(TARGET)/%.o: $(BDKDIR)/%.c
+	@mkdir -p "$(@D)"
+	$(CC) $(CFLAGS) $(BDKINC) -I$(SOURCEDIR) -c $< -o $@
+
+$(BUILDDIR)/$(TARGET)/%.o: $(BDKDIR)/%.S
+	@mkdir -p "$(@D)"
+	$(CC) $(CFLAGS) -c $< -o $@
+
+release: $(OUTPUTDIR)/$(OUTPUT_NAME)
+	@mkdir -p release/bootloader/payloads
+	@cp $(OUTPUTDIR)/$(OUTPUT_NAME) release/bootloader/payloads/$(OUTPUT_NAME)
+	@cd release && zip -r ../$(TARGET)-$(VERSION).zip bootloader
+	@echo "Release package created: $(TARGET)-$(VERSION).zip"
diff --git a/source/dram_fuse.c b/source/dram_fuse.c
new file mode 100644
index 0000000..c97465a
--- /dev/null
+++ b/source/dram_fuse.c
@@ -0,0 +1,46 @@
+/*
+ * DRAM capacity from fuse (SKU), not physical probe.
+ */
+
+#include "dram_fuse.h"
+#include <soc/fuse.h>
+#include <soc/hw_init.h>
+#include <soc/t210.h>
+
+static int mariko_dram_mib(u32 dram_id)
+{
+	switch (dram_id) {
+	case 9:
+	case 13:
+	case 18:
+	case 21:
+	case 23:
+	case 28:
+		return 8192;
+	default:
+		if (dram_id >= 3 && dram_id <= 28)
+			return 4096;
+		return -1;
+	}
+}
+
+static int erista_dram_mib(u32 dram_id)
+{
+	if (dram_id == 4)
+		return 6144;
+	if (dram_id <= 6)
+		return 4096;
+	return -1;
+}
+
+int dram_capacity_mib_from_fuse(void)
+{
+	u32 nid = fuse_read_dramid(false);
+	u32 chip = hw_get_chip_id();
+
+	if (chip == GP_HIDREV_MAJOR_T210)
+		return erista_dram_mib(nid);
+	if (chip == GP_HIDREV_MAJOR_T210B01)
+		return mariko_dram_mib(nid);
+	return -1;
+}
diff --git a/source/dram_fuse.h b/source/dram_fuse.h
new file mode 100644
index 0000000..045e732
--- /dev/null
+++ b/source/dram_fuse.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <utils/types.h>
+
+/* DRAM capacity in MiB from fuse DRAM ID + SoC (same table as RAM test payload). */
+int dram_capacity_mib_from_fuse(void);
diff --git a/source/install.c b/source/install.c
index d5f12e3..dd68165 100644
--- a/source/install.c
+++ b/source/install.c
@@ -3,6 +3,7 @@
  */
 
 #include "install.h"
+#include "dram_fuse.h"
 #include "fs.h"
 #include "version.h"
 #include "gfx.h"
@@ -618,6 +619,50 @@ int delete_path_list(const char* paths[], const char* description) {
     return (failed == 0) ? FR_OK : FR_DISK_ERR;
 }
 
+#define HEKATE_8GB_SRC  "sd:/bootloader/hekate_8gb.bin"
+#define PAYLOAD_BIN_DST "sd:/payload.bin"
+#define UPDATE_BIN_DST  "sd:/bootloader/update.bin"
+
+static void unlink_ignore_err(const char *path)
+{
+    FILINFO fno;
+    if (f_stat(path, &fno) != FR_OK)
+        return;
+    if (fno.fattrib & AM_RDO)
+        f_chmod(path, fno.fattrib & ~AM_RDO, AM_RDO);
+    f_unlink(path);
+}
+
+/* After pack copy: if >4 GiB fuse RAM, install 8GB Hekate to payload.bin + bootloader/update.bin; always remove hekate_8gb.bin when done or if not used. */
+static void install_hekate_8gb_post_copy(void)
+{
+    if (!install_path_exists(HEKATE_8GB_SRC))
+        return;
+
+    int mib = dram_capacity_mib_from_fuse();
+    if (mib > 4096) {
+        install_set_color(COLOR_CYAN);
+        gfx_printf("\nMehr als 4 GB RAM erkannt (Fuse). Die 8-GB-Hekate-Variante wird verwendet.\n");
+        gfx_printf("Kopiere nach payload.bin und bootloader/update.bin...\n");
+        install_set_color(COLOR_WHITE);
+
+        int r1 = file_copy(HEKATE_8GB_SRC, PAYLOAD_BIN_DST);
+        int r2 = file_copy(HEKATE_8GB_SRC, UPDATE_BIN_DST);
+        if (r1 == FR_OK && r2 == FR_OK) {
+            install_set_color(COLOR_GREEN);
+            gfx_printf("  [OK] Hekate 8 GB installiert.\n");
+            install_set_color(COLOR_WHITE);
+            unlink_ignore_err(HEKATE_8GB_SRC);
+        } else {
+            install_set_color(COLOR_ORANGE);
+            gfx_printf("  [WARN] Kopie fehlgeschlagen (payload: %d, update: %d). hekate_8gb.bin bleibt.\n", r1, r2);
+            install_set_color(COLOR_WHITE);
+        }
+    } else {
+        unlink_ignore_err(HEKATE_8GB_SRC);
+    }
+}
+
 // Main installation function
 int perform_installation(omninx_variant_t pack_variant, install_mode_t mode) {
     int res;
@@ -637,7 +682,9 @@ int perform_installation(omninx_variant_t pack_variant, install_mode_t mode) {
         install_set_color(COLOR_WHITE);
         res = update_mode_install(pack_variant);
         if (res != FR_OK) return res;
-        
+
+        install_hekate_8gb_post_copy();
+
         install_check_and_clear_screen_if_needed();
         // Remove staging directory (installed pack)
         res = cleanup_staging_directory(pack_variant);
@@ -676,7 +723,9 @@ int perform_installation(omninx_variant_t pack_variant, install_mode_t mode) {
         install_set_color(COLOR_WHITE);
         res = clean_mode_install(pack_variant);
         if (res != FR_OK) return res;
-        
+
+        install_hekate_8gb_post_copy();
+
         install_check_and_clear_screen_if_needed();
         // Remove staging directory (installed pack)
         res = cleanup_staging_directory(pack_variant);
diff --git a/tools/ram_test_main.c b/tools/ram_test_main.c
new file mode 100644
index 0000000..a412679
--- /dev/null
+++ b/tools/ram_test_main.c
@@ -0,0 +1,70 @@
+/*
+ * Minimal RAM info test payload (fuse DRAM ID + SK table -> MiB).
+ * Build: make ram-test  ->  output/RAM-Test.bin
+ */
+
+#include <display/di.h>
+#include <mem/heap.h>
+#include <mem/minerva.h>
+#include <memory_map.h>
+#include <soc/bpmp.h>
+#include <soc/fuse.h>
+#include <soc/hw_init.h>
+#include <soc/t210.h>
+#include <utils/util.h>
+
+#include "dram_fuse.h"
+#include "gfx.h"
+
+#undef COLOR_CYAN
+#undef COLOR_WHITE
+#define COLOR_CYAN   0xFF00FFFF
+#define COLOR_WHITE  0xFFFFFFFF
+
+/* Required by BDK */
+boot_cfg_t __attribute__((section("._boot_cfg"))) b_cfg;
+volatile nyx_storage_t *nyx_str = (nyx_storage_t *)NYX_STORAGE_ADDR;
+
+extern void pivot_stack(u32 stack_top);
+
+void ipl_main(void)
+{
+	hw_init();
+	pivot_stack(IPL_STACK_TOP);
+	heap_init(IPL_HEAP_START);
+
+	minerva_init();
+	minerva_change_freq(FREQ_800);
+
+	display_init();
+	u32 *fb = display_init_framebuffer_pitch();
+	gfx_init_ctxt(fb, 720, 1280, 720);
+	gfx_con_init();
+	display_backlight_pwm_init();
+	display_backlight_brightness(100, 1000);
+
+	bpmp_clk_rate_set(BPMP_CLK_DEFAULT_BOOST);
+
+	gfx_clear_grey(0x1B);
+	gfx_con_setpos(0, 0);
+	gfx_con_setcol(COLOR_CYAN, gfx_con.fillbg, gfx_con.bgcol);
+	gfx_printf("RAM test payload\n\n");
+	gfx_con_setcol(COLOR_WHITE, gfx_con.fillbg, gfx_con.bgcol);
+
+	u32 raw = fuse_read_dramid(true);
+	u32 nid = fuse_read_dramid(false);
+	u32 chip = hw_get_chip_id();
+	int mib = dram_capacity_mib_from_fuse();
+
+	gfx_printf("SoC:       %s\n", chip == GP_HIDREV_MAJOR_T210B01 ? "Mariko (T210B01)" : "Erista (T210)");
+	gfx_printf("DRAM fuse: raw %d  norm %d\n", raw, nid);
+	if (mib > 0)
+		gfx_printf("Table MiB: %d (fuse SKU, not probe)\n", mib);
+	else
+		gfx_printf("Table MiB: (unknown id for this SoC)\n");
+
+	gfx_printf("\nHang — power off or inject payload.\n");
+
+	while (1)
+		msleep(500);
+}