Mkr 1010 suddenly stop responding

hey guys I have some trouble with my mkr 1010. It wont respond to anything. I plugg in the usb cable and the green light turns on. After this nothing happens. I cant find it in any ports, the reset button wont work (also when pressing twice) and the last uploaded code wont work. The issue happend when I was fiddling with the circuit. The circuit is very simple (a resistor and a LED) and I have been using it many times, only this time I tried to connect a multimeter. I was using a external powersource with 5.4 voltage connected to Vin and ground, only pin 2 that was in use otherwise. There was no heat after it stopped working. Is there a way to test if the board is fried or to fix the issue ? It should be said that the code that was running was using BLE earlier I figured that I need a bit more then 5 V to make arduino work as I wanted

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