Jetson NX does not work

I connected power and HDMI cable to my jetson nx and I could not see anything on the screen. I removed the SD card from jetson and connected the power again and I could not see anything. Then I did everything according to this tutorial “Jetson Nano - Serial Console - YouTube”. I powered it and opened debugging console through UART. I connected USB to tty adapter to RX TX pins of 12 debugging pins. By opening the serial port in another jetson I received this.

What did you receive?

And i cannot type anything to the terminal.

please set up another x86 ubuntu host and flash your NX with sdkmanager.
No other method to recover.

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