diff --git a/Dockerfile b/Dockerfile
index 9753ebd..20ecc07 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,8 +10,8 @@ ARG DEBCONF_NONINTERACTIVE_SEEN="true"
 RUN set -eu && \
     apt-get update && \
     apt-get --no-install-recommends -y install \
-    guestfish \
-    linux-image-generic && \
+    fdisk \
+    mtools && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
diff --git a/config.plist b/config.plist
index 97b4e45..526ce17 100644
--- a/config.plist
+++ b/config.plist
@@ -1015,7 +1015,7 @@
 			<key>HibernateSkipsPicker</key>
 			<false/>
 			<key>HideAuxiliary</key>
-			<true/>
+			<false/>
 			<key>InstanceIdentifier</key>
 			<string></string>
 			<key>LauncherOption</key>
@@ -1037,7 +1037,7 @@
 			<key>TakeoffDelay</key>
 			<integer>0</integer>
 			<key>Timeout</key>
-			<integer>15</integer>
+			<integer>0</integer>
 		</dict>
 		<key>Debug</key>
 		<dict>
@@ -1063,7 +1063,7 @@
 		<key>Security</key>
 		<dict>
 			<key>AllowSetDefault</key>
-			<true/>
+			<false/>
 			<key>ApECID</key>
 			<integer>0</integer>
 			<key>AuthRestart</key>
@@ -1083,7 +1083,7 @@
 			<key>PasswordSalt</key>
 			<data></data>
 			<key>ScanPolicy</key>
-			<integer>17761027</integer>
+			<integer>18809603</integer>
 			<key>SecureBootModel</key>
 			<string>Disabled</string>
 			<key>Vault</key>
@@ -1189,7 +1189,7 @@
 				<key>SystemAudioVolume</key>
 				<data>Rg==</data>
 				<key>boot-args</key>
-				<string>-v keepsyms=1 amfi_get_out_of_my_way=1 tlbto_us=0 vti=9</string>
+				<string>keepsyms=1</string>
 				<key>csr-active-config</key>
 				<data>Jg8=</data>
 				<key>prev-lang:kbd</key>
@@ -1260,11 +1260,13 @@
 			<key>AdviseFeatures</key>
 			<false/>
 			<key>MLB</key>
-			<string>C02119700QXJG36JC</string>
+			<string>C02717306J9JG361M</string>
+			<key>MaxBIOSVersion</key>
+			<false/>
 			<key>ProcessorType</key>
 			<integer>0</integer>
 			<key>ROM</key>
-			<string>0022412e3d4a</string>
+			<data>m7zhIYfl</data>
 			<key>SpoofVendor</key>
 			<true/>
 			<key>SystemMemoryStatus</key>
@@ -1272,9 +1274,9 @@
 			<key>SystemProductName</key>
 			<string>iMacPro1,1</string>
 			<key>SystemSerialNumber</key>
-			<string>C02FPBZPHX87</string>
+			<string>C02TM2ZBHX87</string>
 			<key>SystemUUID</key>
-			<string>213FA768-A62C-4299-8598-47AA666E436F</string>
+			<string>007076A6-F2A2-4461-BBE5-BAD019F8025A</string>
 		</dict>
 		<key>UpdateDataHub</key>
 		<true/>
diff --git a/readme.md b/readme.md
index e4fc0c8..66a6e05 100644
--- a/readme.md
+++ b/readme.md
@@ -61,7 +61,7 @@ kubectl apply -f kubernetes.yml
   
   - Start the container and connect to [port 8006](http://localhost:8006) using your web browser.
 
-  - Select `macOS Base System` by pressing the enter key to begin the installation.
+  - Select `macOS Base System` (by pressing the enter key) to begin the installation.
 
   - Choose `Disk Utility` and then select the largest `Apple Inc. VirtIO Block Media` disk.
 
@@ -69,7 +69,7 @@ kubectl apply -f kubernetes.yml
 
   - Close the current window and proceed the installation by clicking `Reinstall macOS`.
   
-  - When prompted where you want to install macOS, select the disk you just created previously.
+  - When prompted where you want to install it, select the disk you just created previously.
  
   - There will be several reboots, select `macOS Installer` each time until it shows your own disk.
 
diff --git a/src/build.sh b/src/build.sh
index f57cce1..64df478 100644
--- a/src/build.sh
+++ b/src/build.sh
@@ -1,48 +1,67 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
-function msg() {
-  local txt="$1"
-  local bold="\x1b[1m"
-  local normal="\x1b[0m"
-  echo -e "${bold}### ${txt}${normal}"
-}
-
-function cleanup() {
-  if test "$GUESTFISH_PID" != ""; then
-    guestfish --remote -- exit >/dev/null 2>&1 || true
-  fi
-}
-
-function fish() {
-  echo "#" "$@"
-  guestfish --remote -- "$@" || exit 1
-}
-
-rm -rf /images
-msg "Mounting template ISO..."
-
-trap 'cleanup' EXIT
-
-export LIBGUESTFS_BACKEND=direct
-# shellcheck disable=SC2046
-eval $(guestfish --listen)
-if test "$GUESTFISH_PID" = ""; then
-  echo "ERROR: Starting Guestfish failed!"
-  exit 1
+echo "Extracting template image..."
+
+DST="/images"
+OUT="/tmp/extract"
+
+rm -rf "$OUT"
+rm -rf "$DST"
+
+mkdir -p "$OUT"
+mkdir -p "$DST"
+
+if [ ! -f "$1" ] || [ ! -s "$1" ]; then
+  error "Could not find image file \"$1\"." && exit 10
 fi
 
-fish add "$1"
-fish run
-fish mount /dev/sda1 /
-fish ls /EFI
+START=$(sfdisk -l "$1" | grep -i -m 1 "EFI System" | awk '{print $2}')
+mcopy -bspmQ -i "$1@@${START}S" ::EFI "$OUT"
+
+cp "$2" "$OUT/EFI/OC/"
+
+echo "Creating OpenCore image..."
+
+START=2048
+COUNT=522207
+SIZE=268435456
+
+FILE="OpenCore.img"
+IMG="/tmp/$SIZE.img"
+NAME=$(basename "$IMG")
+
+rm -f "$IMG"
+
+if ! truncate -s "$SIZE" "$IMG"; then
+  rm -f "$IMG"
+  error "Could not allocate file $IMG for the OpenCore image." && exit 11
+fi
+
+PART="/tmp/partition.fdisk"
+
+{       echo "label: gpt"
+        echo "label-id: 1ACB1E00-3B8F-4B2A-86A4-D99ED21DCAEB"
+        echo "device: $NAME"
+        echo "unit: sectors"
+        echo "first-lba: 34"
+        echo "last-lba: 524254"
+        echo "sector-size: 512"
+        echo ""
+        echo "${NAME}1 : start=$START, size=$COUNT, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=05157F6E-0AE8-4D1A-BEA5-AC172453D02C, name=\"primary\""
+
+} > "$PART"
+
+sfdisk -q "$IMG" < "$PART"
+
+echo "drive c: file=\"$IMG\" partition=0 offset=1048576" > /etc/mtools.conf
+
+mformat -F -M 512 -c 4 -T "$COUNT" -v "EFI" "C:"
 
-msg "Overriding config..."
+echo "Copying files to image..."
 
-fish copy-in "$2" /EFI/OC/
-fish umount-all
+mcopy -bspmQ "$OUT/EFI" "C:"
 
-mkdir -p /images
-mv "$1" /images/OpenCore.img
+mv -f "$IMG" "$DST/$FILE"
 
-msg "Finished succesfully!"
+echo "Finished succesfully!"