diff --git a/src/boot.sh b/src/boot.sh
index ab43c75..2fc8400 100644
--- a/src/boot.sh
+++ b/src/boot.sh
@@ -45,15 +45,18 @@ DEST="$STORAGE/$DEST"
 
 if [ ! -s "$DEST.rom" ] || [ ! -f "$DEST.rom" ]; then
   [ ! -s "$OVMF/$ROM" ] || [ ! -f "$OVMF/$ROM" ] && error "UEFI boot file ($OVMF/$ROM) not found!" && exit 44
-  cp "$OVMF/$ROM" "$DEST.rom"
-  if [[ "${LOGO:-}" != [Nn]* ]]; then
-    /run/utk.bin "$DEST.rom" replace_ffs LogoDXE "/var/www/img/macos.ffs" save "$DEST.rom"
+  if [[ "${LOGO:-}" == [Nn]* ]]; then
+    cp "$OVMF/$ROM" "$DEST.tmp"
+  else
+    /run/utk.bin "$OVMF/$ROM" replace_ffs LogoDXE "/var/www/img/${PROCESS,,}.ffs" save "$DEST.tmp"
   fi
+  mv "$DEST.tmp" "$DEST.rom"
 fi
 
 if [ ! -s "$DEST.vars" ] || [ ! -f "$DEST.vars" ]; then
   [ ! -s "$OVMF/$VARS" ] || [ ! -f "$OVMF/$VARS" ]&& error "UEFI vars file ($OVMF/$VARS) not found!" && exit 45
-  cp "$OVMF/$VARS" "$DEST.vars"
+  cp "$OVMF/$VARS" "$DEST.tmp"
+  mv "$DEST.tmp" "$DEST.vars"
 fi
 
 BOOT_OPTS+=" -drive if=pflash,format=raw,readonly=on,file=$DEST.rom"