Can not boot after adjust jetson-io settings

I’m trying to get gps data from uarta(ttyTHS0). At the beginning, it works. I’ve tried “cat /dev/ttyTHS0” or read something with coding. But somehow it didn’t work anymore.
I guest the uarta is broken, so I turn on the uartb-cts/rts setting with and reboot. Then my Xavier NX is dead. I try to get something from serial dump, power light is working but nothing shows up. What should I do to testing it’s alive or not? Or how to make it alive?

Flash it back with sdkmanager first since the uart is dead…

Thanks for your help. My borad is alive now. But uarta is still not working. I’ll try to find the other way to solve it.

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