Arduino nano 33 iot no working

[Juraj]

you write that you made the board. I assumed you had to put the bootloader into the SAMD21

i think i bricked my arduino nano 33 iot trying to program it with bossa

You should be able to recover it by burning the bootloader. I'll share some instructions for doing that: You'll need: An extra Arduino board that runs at 3.3 V. An SD slot. This could be built into your Arduino board (e.g., MKR Zero), a shield (e.g., MKR SD Proto Shield), or one of the common SD modules. An SD card that fits your SD slot. A way to connect the SD card to your computer. A way to make the connections to the SWD pins on your target Arduino board. For the Nano 33 IoT and the MKR b…