My Arduino MKR NB suddenly is not programmable over USB anymore. But I verified that it is in fact still working. When I connect a USB to TTL converter directly I get a signal from the MCU over the Serial connection. Furhtermore when it starts it blinks and when I connect the RESET pin to GND the CHRG LED blinks.
Is there a way how I can still program it using my USB to TTL converter? It's not entirely broken and since it was pretty expensive I really don't want to buy a new one while this one is (technically) still working.
Here's an image how I wired everything up:
