diff --git a/generate-specific-bootdisk.sh b/generate-specific-bootdisk.sh
index 48070a0..d0720aa 100755
--- a/generate-specific-bootdisk.sh
+++ b/generate-specific-bootdisk.sh
@@ -245,7 +245,8 @@ generate_bootdisk () {
             && [ "${UUID}" ] \
             && [ "${MAC_ADDRESS}" ]; then
         ROM="${MAC_ADDRESS//\:/}"
-        ROM="${ROM,,}"
+        ROM="$(awk '{print tolower($0)}' <<< "${ROM}")"
+        ROM="$(base64 <<< "${ROM}")"
         sed -e s/\{\{DEVICE_MODEL\}\}/"${DEVICE_MODEL}"/g \
             -e s/\{\{SERIAL\}\}/"${SERIAL}"/g \
             -e s/\{\{BOARD_SERIAL\}\}/"${BOARD_SERIAL}"/g \
diff --git a/generate-unique-machine-values.sh b/generate-unique-machine-values.sh
index 9577356..78f7e97 100755
--- a/generate-unique-machine-values.sh
+++ b/generate-unique-machine-values.sh
@@ -338,6 +338,7 @@ EOF
                 source "${OUTPUT_ENV_FILE}"
                 ROM="${MAC_ADDRESS//\:/}"
                 ROM="$(awk '{print tolower($0)}' <<< "${ROM}")"
+                ROM="$(base64 <<< "${ROM}")"
                 sed -e s/\{\{DEVICE_MODEL\}\}/"${DEVICE_MODEL}"/g \
                     -e s/\{\{SERIAL\}\}/"${SERIAL}"/g \
                     -e s/\{\{BOARD_SERIAL\}\}/"${BOARD_SERIAL}"/g \