Remove firmware update hint as firmware update is not possible anymore

Author: pfink

README.md

@@ -6,10 +6,6 @@
 
 An application based on [getsenic/nuimo-linux-python](https://github.com/getsenic/nuimo-linux-python) to use your Nuimo as a UI for [openHAB](https://www.openhab.org/)!
 
-## Preparation
-
-Before you get started here, please update the firmware of your Nuimo to the latest version using the Android / iOS app by Senic. Afterwards, disconnect your Nuimo from this app.
-
 ## Installation (Linux only)
 
 1. Make sure bluez version 5.43 or higher  is installed. Normally, you can check your bluez version by executing this command: `bluetoothd --version`.