diff --git a/export-image/04-set-partuuid/00-run.sh b/export-image/04-set-partuuid/00-run.sh
index 99500f36fb..e528c3bfde 100755
--- a/export-image/04-set-partuuid/00-run.sh
+++ b/export-image/04-set-partuuid/00-run.sh
@@ -11,3 +11,22 @@ sed -i "s/BOOTDEV/PARTUUID=${BOOT_PARTUUID}/" "${ROOTFS_DIR}/etc/fstab"
 sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${ROOTFS_DIR}/etc/fstab"
 
 sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${ROOTFS_DIR}/boot/firmware/cmdline.txt"
+
+# Normalize CardputerZero cmdline for this image and keep console/splash/plymouth out.
+if grep -q "dtoverlay=cardputerzero" "${ROOTFS_DIR}/boot/firmware/config.txt" 2>/dev/null; then
+    awk '
+    {
+        out = ""
+        for (i = 1; i <= NF; i++) {
+            if ($i != "console=serial0,115200" && $i != "splash" && $i != "plymouth.ignore-serial-consoles") {
+                out = out (out == "" ? "" : " ") $i
+            }
+        }
+        print out
+    }
+    ' "${ROOTFS_DIR}/boot/firmware/cmdline.txt" > "${ROOTFS_DIR}/boot/firmware/cmdline.txt.tmp"
+    mv "${ROOTFS_DIR}/boot/firmware/cmdline.txt.tmp" "${ROOTFS_DIR}/boot/firmware/cmdline.txt"
+
+    # Keep boot/cmdline.txt aligned with the file actually mounted in verify.
+    cp "${ROOTFS_DIR}/boot/firmware/cmdline.txt" "${ROOTFS_DIR}/boot/cmdline.txt"
+fi
diff --git a/stage2/05-cardputerzero/02-run.sh b/stage2/05-cardputerzero/02-run.sh
index 87d2311b28..b7f03cc916 100755
--- a/stage2/05-cardputerzero/02-run.sh
+++ b/stage2/05-cardputerzero/02-run.sh
@@ -107,10 +107,27 @@ sed -i '1i kernel=u-boot.bin' ${ROOTFS_DIR}/boot/firmware/config.txt
 
 
 
-# Append cmdline.txt parameters
-sed -i 's/$/ quiet splash plymouth.ignore-serial-consoles fbcon=map:off cfg80211.ieee80211_regdom=AE/' \
+# Append custom cmdline parameters for CardputerZero.
+sed -i 's/$/ quiet fbcon=map:off cfg80211.ieee80211_regdom=AE/' \
     "${ROOTFS_DIR}/boot/firmware/cmdline.txt"
 
+# Clean up CardputerZero cmdline tokens.
+for cmd in "${ROOTFS_DIR}/boot/firmware/cmdline.txt" "${ROOTFS_DIR}/boot/cmdline.txt"; do
+    [ -f "$cmd" ] || continue
+    awk '
+        {
+            out = ""
+            for (i = 1; i <= NF; i++) {
+                if ($i != "console=serial0,115200" && $i != "splash" && $i != "plymouth.ignore-serial-consoles") {
+                    out = out (out == "" ? "" : " ") $i
+                }
+            }
+            print out
+        }
+    ' "$cmd" > "${cmd}.tmp"
+    mv "${cmd}.tmp" "$cmd"
+done
+
 # Module load config
 cat > "${ROOTFS_DIR}/etc/modules-load.d/cardputerzero.conf" << 'EOF'
 i2c-dev
diff --git a/tools/verify-image.sh b/tools/verify-image.sh
index bb3e2fab56..547f1c584c 100755
--- a/tools/verify-image.sh
+++ b/tools/verify-image.sh
@@ -92,10 +92,52 @@ else
 fi
 
 # Check cmdline.txt
-if grep -q "quiet splash" "$TMPDIR/boot/cmdline.txt" 2>/dev/null; then
-    pass "cmdline.txt: quiet splash"
+if awk '
+{
+    for (i = 1; i <= NF; i++) {
+        if ($i == "quiet") {
+            ok = 1
+            break
+        }
+    }
+}
+END {
+    exit (ok ? 0 : 1)
+}
+' "$TMPDIR/boot/cmdline.txt" 2>/dev/null; then
+    pass "cmdline.txt: quiet present"
 else
-    fail "cmdline.txt: missing quiet splash"
+    fail "cmdline.txt: quiet missing"
+fi
+
+if awk '
+{
+    for (i = 1; i <= NF; i++) {
+        if ($i == "splash") {
+            ok = 1
+            break
+        }
+    }
+}
+END {
+    exit (ok ? 0 : 1)
+}
+' "$TMPDIR/boot/cmdline.txt" >/dev/null 2>&1; then
+    fail "cmdline.txt: splash should be removed for CardputerZero"
+else
+    pass "cmdline.txt: splash removed"
+fi
+
+if grep -q "plymouth.ignore-serial-consoles" "$TMPDIR/boot/cmdline.txt" 2>/dev/null; then
+    fail "cmdline.txt: plymouth.ignore-serial-consoles should be removed for CardputerZero"
+else
+    pass "cmdline.txt: plymouth.ignore-serial-consoles removed"
+fi
+
+if grep -q "console=serial0,115200" "$TMPDIR/boot/cmdline.txt" 2>/dev/null; then
+    fail "cmdline.txt: console=serial0,115200 should be removed for CardputerZero"
+else
+    pass "cmdline.txt: console=serial0,115200 removed"
 fi
 
 umount "$TMPDIR/boot" 2>/dev/null || true