So I made a PCB based on the Arduino MKR wifi 1010 schematic and I have sensors directly connected to the ATSAMD21G18-MU microcontroller. I used a reflow oven for the comments and noticed only a small amount of leads touch for the microcontroller and another IC which I fixed. When turning it on, all the led lights come on and my test points get the correct voltage around the board.
Next, I flashed the microcontroller. I used an Atmel ICE and connected it to the back side of my board which is where I have the programing pads and SMD connectors.
I uploaded a hex file I got from github and flashed the IC. But the native MicroUSB port didn't show up when connecting to it.
I next tried to flash using Arduino IDE, I selected my programmer and the board Arduino mkr 1010, and clicked burn boot loader but again, didn't get any response from the native MicroUSB port.
I am kind of stuck on what the issue could be. I don't believe it's a PCB routing issue. Maybe a small chance it's the IC but I doubt it. Has anyone run into this issue and could give some tips on how I should proceed? Any info helps a lot. Thanks.