diff --git a/Fotobox.py b/Fotobox.py
index 6786aaa..56d77ec 100644
--- a/Fotobox.py
+++ b/Fotobox.py
@@ -15,6 +15,7 @@ from enum import Enum
 
 from config import read, file_increase, iso, now
 from timer import Timer
+from libcamera import Transform
 
 
 class State(Enum):
@@ -36,6 +37,7 @@ class Fotobox:
         camera.rotation = 270
         camera.preview_configuration.main.size = res
         camera.preview_configuration.main.format = 'BGR888'
+        camera.preview_configuration.transform = Transform(hflip=1, vflip=1)
         camera.configure("preview")
         #####################
         # here configure still capture
@@ -221,7 +223,7 @@ class Fotobox:
             print("Starting shooting: S%04d-%s" % (self._shooting_number, iso(self._shooting_datetime)))
             self._shooting_timer.restart()
         elif new_state == State.PREPARE:
-            self._camera.stop_preview()
+            #self._camera.stop_preview()
             for photo in self._photos:
                 photo.prepare(self._event)
             self._set_state(State.CHOOSE)
diff --git a/INSTALL b/INSTALL
index 7ee34bb..672d493 100644
--- a/INSTALL
+++ b/INSTALL
@@ -6,3 +6,6 @@ python3 -m venv venv --system-site-packages
 . venv/bin/activate
 pip install pygame qrcode escpos picamera2
 
+add to /boot/firmware/cmdline.txt
+video=DSI-1:800x480@60,rotate=<rotation-value>
+