My MKR1000 wont let files be uploaded to it, please help!

I have 5 MKR1000 boards.

2 of the 5 are not getting detected on any com port, doesn't even appear in any unknown devices category.

They don't even make any sound when connected, while other 3 are working normal.

I have uploaded program on them earlier, but now they act like they are dead.

On board LED glows definitely but they don't do any processing.

The sketch uploaded on them when they were working, doesn't work anymore on reset.

Double tapping reset button - doesn't work.