diff --git a/Dockerfile b/Dockerfile
index 77445c9..f9570ab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -281,7 +281,7 @@ CMD sudo chown -R $(id -u):$(id -g) /dev/kvm /dev/snd "${IMAGE_PATH}" "${BOOTDIS
         --tsv ./serial.tsv \
         --bootdisks \
         --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
-        --output-env "${ENV:=/env}" \
+        --output-env "${ENV:=/env}" || exit 1 \
     ; } \
     ; [[ "${GENERATE_SPECIFIC}" == true ]] && { \
             source "${ENV:=/env}" \
@@ -291,7 +291,7 @@ CMD sudo chown -R $(id -u):$(id -g) /dev/kvm /dev/snd "${IMAGE_PATH}" "${BOOTDIS
             --board-serial "${BOARD_SERIAL}" \
             --uuid "${UUID}" \
             --mac-address "${MAC_ADDRESS}" \
-            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
+            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" || exit 1 \
     ; } \
     ; case "$(file --brief /bootdisk)" in \
         QEMU\ QCOW2\ Image* ) export BOOTDISK=/bootdisk \
diff --git a/Dockerfile.auto b/Dockerfile.auto
index 15f6339..6f6b739 100644
--- a/Dockerfile.auto
+++ b/Dockerfile.auto
@@ -153,7 +153,7 @@ CMD echo "${BOILERPLATE}" \
         --tsv ./serial.tsv \
         --bootdisks \
         --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
-        --output-env "${ENV:=/env}" \
+        --output-env "${ENV:=/env}" || exit 1 \
     ; } \
     ; [[ "${GENERATE_SPECIFIC}" == true ]] && { \
             source "${ENV:=/env}" \
@@ -163,7 +163,7 @@ CMD echo "${BOILERPLATE}" \
             --board-serial "${BOARD_SERIAL}" \
             --uuid "${UUID}" \
             --mac-address "${MAC_ADDRESS}" \
-            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
+            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" || exit 1 \
     ; } \
     ; case "$(file --brief /bootdisk)" in \
         QEMU\ QCOW2\ Image* ) export BOOTDISK=/bootdisk \
diff --git a/Dockerfile.naked b/Dockerfile.naked
index 5c17c93..04368bc 100644
--- a/Dockerfile.naked
+++ b/Dockerfile.naked
@@ -126,7 +126,7 @@ CMD sudo chown -R $(id -u):$(id -g) /dev/kvm /dev/snd "${IMAGE_PATH}" "${BOOTDIS
         --tsv ./serial.tsv \
         --bootdisks \
         --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
-        --output-env "${ENV:=/env}" \
+        --output-env "${ENV:=/env}" || exit 1 \
     ; } \
     ; [[ "${GENERATE_SPECIFIC}" == true ]] && { \
             source "${ENV:=/env}" \
@@ -136,7 +136,7 @@ CMD sudo chown -R $(id -u):$(id -g) /dev/kvm /dev/snd "${IMAGE_PATH}" "${BOOTDIS
             --board-serial "${BOARD_SERIAL}" \
             --uuid "${UUID}" \
             --mac-address "${MAC_ADDRESS}" \
-            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" \
+            --output-bootdisk "${BOOTDISK:-/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore.qcow2}" || exit 1 \
     ; } \
     ; case "$(file --brief /bootdisk)" in \
         QEMU\ QCOW2\ Image* ) export BOOTDISK=/bootdisk \
diff --git a/README.md b/README.md
index 78e1f52..5cba153 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,7 @@ If you run out of space, you can delete all your Docker images/history/cache by
 
 docker pull sickcodes/docker-osx:auto
 
-# boot directly into a real OSX shell with no display (Xvfb)
+# boot directly into a real OSX shell with no display (Xvfb) [HEADLESS]
 docker run -it \
     --device /dev/kvm \
     -p 50922:10022 \
@@ -92,7 +92,7 @@ docker run -it \
 
 docker pull sickcodes/docker-osx:auto
 
-# boot directly into a real OSX shell with a visual display
+# boot directly into a real OSX shell with a visual display [NOT HEADLESS]
 docker run -it \
     --device /dev/kvm \
     -p 50922:10022 \
@@ -144,6 +144,7 @@ Supply your own local image with `-v "${PWD}/mac_hdd_ng.img:/image"` and use `si
 docker pull sickcodes/docker-osx:naked
 
 # run your own image + SSH
+# change mac_hdd_ng.img
 docker run -it \
     --device /dev/kvm \
     -p 50922:10022 \
diff --git a/custom/generate-unique-machine-values.sh b/custom/generate-unique-machine-values.sh
index 6692e29..4b2409a 100755
--- a/custom/generate-unique-machine-values.sh
+++ b/custom/generate-unique-machine-values.sh
@@ -183,6 +183,8 @@ download_qcow_efi_folder () {
 
 
 generate_serial_sets () {
+    [[ -e ./config-nopicker-custom.plist ]] || wget https://raw.githubusercontent.com/sickcodes/Docker-OSX/custom-identity/custom/config-nopicker-custom.plist
+    [[ -e ./opencore-image-ng.sh ]] || wget https://raw.githubusercontent.com/sickcodes/Docker-OSX/custom-identity/custom/opencore-image-ng.sh && chmod +x opencore-image-ng.sh
     mkdir -p "${OUTPUT_DIRECTORY}/envs"
     export DATE_NOW="$(date +%F-%T)"
     export DEVICE_MODEL="${DEVICE_MODEL:=iMacPro1,1}"