diff --git a/Makefile.starkernel b/Makefile.starkernel
index e38cddc..8faac39 100644
--- a/Makefile.starkernel
+++ b/Makefile.starkernel
@@ -556,6 +556,7 @@ KERNEL_OBJS := \
 
 .PHONY: all clean clean-kernel kernel kernel-all
 .PHONY: qemu qemu-esp qemu-gdb
+.PHONY: thumbdrive
 .PHONY: info help
 
 # ==============================================================================
@@ -1001,8 +1002,42 @@ else ifeq ($(ARCH),riscv64)
 	echo "=== Serial log: $$LOG ==="; \
 	echo "=== Extracting DOE CSV ==="; \
 	bash scripts/extract_doe.sh $$LOG $$CSV || true; \
-	cp $$CSV $(DOE_LATEST_DIR)/riscv64.csv 2>/dev/null || true
-endif
+ 	cp $$CSV $(DOE_LATEST_DIR)/riscv64.csv 2>/dev/null || true
+ endif
+
+# thumbdrive — build a generic UEFI-bootable GPT/FAT32 disk image that can be
+# written directly to a USB thumbdrive (dd) and boots on real amd64 UEFI
+# hardware (e.g. Beelink SER5) as well as under QEMU. This is the "generic
+# thumbdrive bootable OS" image for the v2.5.0/SER5 bare-metal path: the
+# monolithic loader embeds the whole kernel, so the ESP needs only the UEFI
+# fallback boot path EFI/BOOT/BOOT<ARCH>.EFI. Storage on real hardware is the
+# USB BOT/xHCI path (already live), not virtio.
+thumbdrive: all
+	@mkdir -p $(BUILD_DIR)
+	@if ! which sgdisk >/dev/null 2>&1; then echo "Error: sgdisk not found. Install gdisk (apt-get install gdisk)."; exit 1; fi
+	@if ! which mkfs.fat >/dev/null 2>&1; then echo "Error: mkfs.fat not found. Install dosfstools (apt-get install dosfstools)."; exit 1; fi
+	@case "$(ARCH)" in \
+		amd64)  BOOTNAME="BOOTX64.EFI"    ;; \
+		aarch64) BOOTNAME="BOOTAA64.EFI"  ;; \
+		riscv64) BOOTNAME="BOOTRISCV64.EFI" ;; \
+		*) echo "Error: no thumbdrive EFI boot name for ARCH=$(ARCH)"; exit 1 ;; \
+	esac; \
+	DISK=$(BUILD_DIR)/starkernel-thumbdrive.img; \
+	rm -f $$DISK $(BUILD_DIR)/thumbdrive-esp.img; \
+	dd if=/dev/zero of=$(BUILD_DIR)/thumbdrive-esp.img bs=512 count=131072 2>/dev/null; \
+	mkfs.fat -F 32 -n "STARKERNEL" $(BUILD_DIR)/thumbdrive-esp.img >/dev/null 2>&1; \
+	mmd    -i $(BUILD_DIR)/thumbdrive-esp.img ::/EFI; \
+	mmd    -i $(BUILD_DIR)/thumbdrive-esp.img ::/EFI/BOOT; \
+	mcopy  -i $(BUILD_DIR)/thumbdrive-esp.img $(LOADER_EFI) ::/EFI/BOOT/$$BOOTNAME; \
+	printf 'FS0:\\EFI\\BOOT\\%s\r\n' "$$BOOTNAME" > $(BUILD_DIR)/thumbdrive-startup.nsh; \
+	mcopy -i $(BUILD_DIR)/thumbdrive-esp.img $(BUILD_DIR)/thumbdrive-startup.nsh ::/startup.nsh; \
+	dd if=/dev/zero of=$$DISK bs=1M count=64 2>/dev/null; \
+	sgdisk -n 1:2048:0 -t 1:ef00 -c 1:"EFI System" $$DISK >/dev/null 2>&1; \
+	dd if=$(BUILD_DIR)/thumbdrive-esp.img of=$$DISK bs=512 seek=2048 conv=notrunc 2>/dev/null; \
+	rm -f $(BUILD_DIR)/thumbdrive-esp.img $(BUILD_DIR)/thumbdrive-startup.nsh; \
+	echo "Thumbdrive image: $$DISK"; \
+	echo "Write to a USB stick with: dd if=$$DISK of=/dev/sdX bs=4M status=progress"
+
 
 # qemu-esp — interactive dev boot from FAT directory (no disk image rebuild,
 # no auto-kill/timeout/DOE-injection logic — stays up until you quit it
@@ -1136,6 +1171,7 @@ help:
 	@echo "  qemu          — clean boot, serial tee'd live + logs/<session>/<arch>/ + DOE CSV → doe/ (all arches)"
 	@echo "  qemu-esp      — quick boot from FAT directory (amd64, aarch64)"
 	@echo "  qemu-gdb      — boot with GDB stub on :1234"
+	@echo "  thumbdrive    — build generic GPT/FAT32 UEFI disk image (write to a USB stick with dd; real-hardware/SER5 path)"
 	@echo ""
 	@echo "QEMU display:"
 	@echo "  QEMU_DISPLAY=gtk   — framebuffer window backend for 'qemu' goal (default: gtk)"
diff --git a/capsules/BLOCK_MAP.md b/capsules/BLOCK_MAP.md
index 1d5369c..9e28d25 100644
--- a/capsules/BLOCK_MAP.md
+++ b/capsules/BLOCK_MAP.md
@@ -1,5 +1,5 @@
 # Capsule Block Manifest — Auto-generated
-<!-- Generated by mkcapsule --manifest  2026-08-29T14:08:16Z -->
+<!-- Generated by mkcapsule --manifest  2026-08-29T14:11:01Z -->
 <!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->
 <!-- Hand-written justifications and immutability notes live  -->
 <!-- in MANIFEST.md alongside this auto-generated index.      -->
diff --git a/disk/artemis.img b/disk/artemis.img
index f5306e8..ef93081 100644
Binary files a/disk/artemis.img and b/disk/artemis.img differ