Die Frontplatte scheint deaktiviert zu sein

[zdzislaw22]

how? with the rsr232? with which software? I tried using the RS232 but can not see anything

Real RS-232 (not through usb interface), correct cable & putty. If you have another tuner, first try if all working correctly.
The procedure:
- switch tuner off
- connect all cables
- turn putty on and select your com port and press ok
- new connection window should appear
- turn tuner on.
- you will see uboot starting. You need to stop booting sequence before hung


For HDMU: you need to always add "rm i2s" before restarting tuner. This is missing in your script.