diff --git a/Makefile b/Makefile
index a2909d1c..2560a381 100644
--- a/Makefile
+++ b/Makefile
@@ -198,15 +198,18 @@ test-app/image.elf: wolfboot.elf
 	$(Q)$(MAKE) -C test-app WOLFBOOT_ROOT="$(WOLFBOOT_ROOT)" image.elf
 	$(Q)$(SIZE) test-app/image.elf
 
-internal_flash.dd: $(BINASSEMBLE) wolfboot.bin $(BOOT_IMG) $(PRIVATE_KEY) test-app/image_v1_signed.bin
-	@echo "\t[MERGE] internal_flash.dd"
-	$(Q)dd if=/dev/zero bs=1 count=$$(($(WOLFBOOT_SECTOR_SIZE))) > /tmp/swap
-	$(Q)$(BINASSEMBLE) $@ \
+assemble_internal_flash.dd: FORCE
+	$(Q)$(BINASSEMBLE) internal_flash.dd \
 		0 wolfboot.bin \
 		$$(($(WOLFBOOT_PARTITION_BOOT_ADDRESS) - $(ARCH_FLASH_OFFSET))) test-app/image_v1_signed.bin \
 		$$(($(WOLFBOOT_PARTITION_UPDATE_ADDRESS)-$(ARCH_FLASH_OFFSET))) /tmp/swap \
 		$$(($(WOLFBOOT_PARTITION_SWAP_ADDRESS)-$(ARCH_FLASH_OFFSET))) /tmp/swap
 
+internal_flash.dd: $(BINASSEMBLE) wolfboot.bin $(BOOT_IMG) $(PRIVATE_KEY) test-app/image_v1_signed.bin
+	@echo "\t[MERGE] internal_flash.dd"
+	$(Q)dd if=/dev/zero bs=1 count=$$(($(WOLFBOOT_SECTOR_SIZE))) > /tmp/swap
+	make assemble_internal_flash.dd
+
 factory.bin: $(BINASSEMBLE) wolfboot.bin $(BOOT_IMG) $(PRIVATE_KEY) test-app/image_v1_signed.bin
 	@echo "\t[MERGE] $@"
 	$(Q)$(BINASSEMBLE) $@ \
diff --git a/test-app/app_sim.c b/test-app/app_sim.c
index e200db55..2b058c6f 100644
--- a/test-app/app_sim.c
+++ b/test-app/app_sim.c
@@ -70,7 +70,31 @@ int do_cmd(const char *cmd)
     if (strcmp(cmd, "reset") == 0) {
         exit(0);
     }
+    if (strncmp(cmd, "get_tlv",7) == 0) {
+        uint8_t* imageHdr = (uint8_t*)WOLFBOOT_PARTITION_BOOT_ADDRESS;
+        uint8_t* ptr = NULL;
+        uint16_t tlv = 0x34; /* default */
+        int size;
+        int i;
 
+        const char* tlvStr = strstr(cmd, "get_tlv=");
+        if (tlvStr) {
+            tlvStr += strlen("get_tlv=");
+            tlv = (uint16_t)atoi(tlvStr);
+        }
+        printf("Get TLV %04x\r\n", tlv);
+
+        size = wolfBoot_find_header(imageHdr + IMAGE_HEADER_OFFSET, tlv, &ptr);
+        if (size >= 0 && ptr != NULL) {
+            /* From here, the value 0xAABBCCDD is at ptr */
+            printf("TLV 0x%x:\n", tlv);
+            for (i=0; i<size; i++) {
+                printf(" 0x%02X ", ptr[i]);
+            }
+            printf("\n");
+        }
+        return 0;
+    }
     /* wrong command */
     return -1;
 }
diff --git a/tools/keytools/sign.c b/tools/keytools/sign.c
index 41b51ff6..ce68fdee 100644
--- a/tools/keytools/sign.c
+++ b/tools/keytools/sign.c
@@ -1085,7 +1085,10 @@ static int make_header_ex(int is_diff, uint8_t *pubkey, uint32_t pubkey_sz,
         uint32_t i;
         for (i = 0; i < CMD.custom_tlvs; i++) {
             /* require 8-byte alignment */
-            while ((header_idx % 8) != 0)
+            /* The offset '4' takes into account 2B Tag + 2B Len, so that the 
+             * Value starts at (addr % 8 == 0) position.
+             */
+            while ((header_idx % 8) != 4)
                 header_idx++;
 
             if (CMD.custom_tlv[i].buffer == NULL) {
@@ -1099,7 +1102,10 @@ static int make_header_ex(int is_diff, uint8_t *pubkey, uint32_t pubkey_sz,
     }
 
     /* Add padding bytes. Sha-3 val field requires 8-byte alignment */
-    while ((header_idx % 8) != 0)
+    /* The offset '4' takes into account 2B Tag + 2B Len, so that the Value 
+     * starts at (addr % 8 == 0) position.
+     */
+    while ((header_idx % 8) != 4)
         header_idx++;
 
     /* Calculate hashes */