Holybro Telemetry 433Mhz transmitter update

I am from Austria.
Excuse me my english is very bad.
I have updatet my 2 Holybro transmitter 433MHz, 0.5 Watt with qgrundcontrol, and now the transmitter do not work, defekt?
Before the work good with pixhawk 4.
I have px4 v1.9.1 installed.
Can you help me.
Thank you very much