diff --git a/doc/installPi.sh b/doc/installPi.sh
index f4d489d..4257f32 100644
--- a/doc/installPi.sh
+++ b/doc/installPi.sh
@@ -65,6 +65,7 @@ sudo -u itender mkdir -p /home/itender/bin
 sudo -u itender sh -c 'curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=/home/itender/bin/ sh'
 sudo -u itender /home/itender/bin/arduino-cli config init
 sudo -u itender /home/itender/bin/arduino-cli core update-index || true
+sudo -u itender /home/itender/bin/arduino-cli core install arduino:avr || true
 sudo -u itender /home/itender/bin/arduino-cli lib install ArduinoJson || true
 sudo -u itender /home/itender/bin/arduino-cli lib install HX711 || true
 
diff --git a/src/routes/ws/websocketRoute.ts b/src/routes/ws/websocketRoute.ts
index e554a7a..67d36bd 100644
--- a/src/routes/ws/websocketRoute.ts
+++ b/src/routes/ws/websocketRoute.ts
@@ -303,7 +303,7 @@ router.ws('/', async (ws, req, next) => {
                         WebSocketHandler.answerRequest(msg.data["type"] as RequestType, true);
 
                         try {
-                            let result = await exec(path.join(global.appRoot, "/update.sh"));
+                            let result = await exec(path.join(global.appRoot, "/../update.sh"));
                             if (result.stderr)
                                 await WebSocketHandler.send(new WebSocketPayload(WebSocketEvent.ERROR, "Der iTender konnte das Update nicht installieren.<br>Möglicherweise ist die Internetverbindung nicht ausreichend oder das Update enthält Fehler.<br>"));
                         } catch (e ) {