diff --git a/hal/sim.c b/hal/sim.c
index 2810af9e..b9640694 100644
--- a/hal/sim.c
+++ b/hal/sim.c
@@ -61,7 +61,7 @@ static int mmap_file(const char *path, uint8_t *address, uint8_t** ret_address)
 
     fd = open(path, O_RDWR);
     if (fd == -1) {
-        printf("can't open %s\n", path);
+        fprintf(stderr,"can't open %s\n", path);
         return -1;
     }
 
@@ -110,9 +110,11 @@ int hal_flash_erase(uint32_t address, int len)
     uint8_t *ptr = 0;
 
     /* implicit cast abide compiler warning */
-    printf("hal_flash_erase addr %p len %d\n", address, len);
+    fprintf(stderr,"hal_flash_erase addr %p len %d\n", address, len);
     if (address == erasefail_address) {
-        printf("POWER FAILURE\n");
+        fprintf(stderr,"POWER FAILURE\n");
+        /* Corrupt page */
+        memset(ptr + address, 0xEE, len);
         exit(0);
     }
     memset(ptr + address, 0xff, len);
@@ -127,14 +129,14 @@ void hal_init(void)
     ret = mmap_file(INTERNAL_FLASH_FILE,
                     (uint8_t*)WOLFBOOT_PARTITION_BOOT_ADDRESS, &p);
     if (ret != 0) {
-        printf("failed to load internal flash file\n");
+        fprintf(stderr,"failed to load internal flash file\n");
         exit(-1);
     }
 
 #ifdef EXT_FLASH
     ret = mmap_file(EXTERNAL_FLASH_FILE, NULL, &flash_base);
     if (ret != 0) {
-        printf("failed to load internal flash file\n");
+        fprintf(stderr,"failed to load internal flash file\n");
         exit(-1);
     }
 #endif /* EXT_FLASH */
@@ -142,7 +144,7 @@ void hal_init(void)
     for (i = 1; i < main_argc; i++) {
         if (strcmp(main_argv[i], "powerfail") == 0) {
             erasefail_address = strtol(main_argv[++i], NULL,  16);
-            printf("Set power fail to erase at address %p\n", erasefail_address);
+            fprintf(stderr,"Set power fail to erase at address %p\n", erasefail_address);
             break;
         }
     }
@@ -184,18 +186,18 @@ void do_boot(const uint32_t *app_offset)
 
     fd = memfd_create("test_app", 0);
     if (fd == -1) {
-        printf("memfd error\n");
+        fprintf(stderr,"memfd error\n");
         exit(-1);
     }
 
     ret = write(fd, app_offset, WOLFBOOT_PARTITION_SIZE);
     if (ret != WOLFBOOT_PARTITION_SIZE) {
-        printf("can't write test-app to memfd\n");
+        fprintf(stderr,"can't write test-app to memfd\n");
         exit(-1);
     }
 
     ret = fexecve(fd, main_argv, envp);
-    printf("fexecve error\n");
+    fprintf(stderr,"fexecve error\n");
     exit(1);
 }
 
diff --git a/test-app/app_sim.c b/test-app/app_sim.c
index 9cfb82b3..a7de122a 100644
--- a/test-app/app_sim.c
+++ b/test-app/app_sim.c
@@ -76,4 +76,4 @@ int main(int argc, char *argv[]) {
     return 0;
 
 }
-#endif /** PLATFROM_sim **/
+#endif /** PLATFORM_sim **/
diff --git a/tools/scripts/sim-sunnyday-update.sh b/tools/scripts/sim-sunnyday-update.sh
new file mode 100755
index 00000000..3effcc28
--- /dev/null
+++ b/tools/scripts/sim-sunnyday-update.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+V=`./wolfboot.elf update_trigger get_version 2>/dev/null`
+if [ "x$V" != "x1" ]; then
+    echo "Failed first boot with update_trigger"
+    exit 1
+fi
+
+
+V=`./wolfboot.elf success get_version 2>/dev/null`
+if [ "x$V" != "x2" ]; then
+    echo "Failed update (V: $V)"
+    exit 1
+fi
+
+echo Test successful.
+exit 0
+
+
diff --git a/tools/scripts/sim-update-fallback.sh b/tools/scripts/sim-update-fallback.sh
new file mode 100755
index 00000000..087a8d22
--- /dev/null
+++ b/tools/scripts/sim-update-fallback.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+V=`./wolfboot.elf update_trigger get_version 2>/dev/null`
+if [ "x$V" != "x1" ]; then
+    echo "Failed first boot with update_trigger"
+    exit 1
+fi
+
+
+V=`./wolfboot.elf get_version 2>/dev/null`
+if [ "x$V" != "x2" ]; then
+    echo "Failed update (V: $V)"
+    exit 1
+fi
+
+V=`./wolfboot.elf get_version 2>/dev/null`
+if [ "x$V" != "x1" ]; then
+    echo "Failed fallback (V: $V)"
+    exit 1
+fi
+
+echo Test successful.
+exit 0
+
+
diff --git a/tools/scripts/sim-update-powerfail-resume.sh b/tools/scripts/sim-update-powerfail-resume.sh
new file mode 100755
index 00000000..18983e4d
--- /dev/null
+++ b/tools/scripts/sim-update-powerfail-resume.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+V=`./wolfboot.elf update_trigger get_version 2>/dev/null`
+if [ "x$V" != "x1" ]; then
+    echo "Failed first boot with update_trigger"
+    exit 1
+fi
+
+
+./wolfboot.elf powerfail 15000 get_version 2>/dev/null
+./wolfboot.elf powerfail 18000 get_version 2>/dev/null
+./wolfboot.elf powerfail 1a000 get_version 2>/dev/null
+
+V=`./wolfboot.elf get_version 2>/dev/null`
+if [ "x$V" != "x2" ]; then
+    echo "Failed update (V: $V)"
+    exit 1
+fi
+
+./wolfboot.elf powerfail 11000 get_version 2>/dev/null
+./wolfboot.elf powerfail 14000 get_version 2>/dev/null
+./wolfboot.elf powerfail 1e000 get_version 2>/dev/null
+
+V=`./wolfboot.elf get_version 2>/dev/null`
+if [ "x$V" != "x1" ]; then
+    echo "Failed fallback (V: $V)"
+    exit 1
+fi
+
+echo Test successful.
+exit 0
+
+