Thingy 53 doesn't work

Hi, i was trying to test some samples with my thingy53 but it seems it brokes up... I tried to flash the blinky sample by using an external debug probe, after that nothing appened.

When i try to switch on/off there's no more led blinking. Also conneting thingy with my PC with USB-C no notice of connection is reported.

I've flashed the sample connecting the thingy53 with the nrf5340 using the appropriate cable, switching the thingy on and cennecting the  thingy with the USB-C cable to the power and the nrf5340 to the PC.

How can i solve this? 

thanks

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