Custom board using RP2040 - Impossible to find in USB

Projects Programming
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Hi,

I just finished a custom board using a RP2040 based on QT RP2040 PY designs. I tried to flash it over USB but the CPU is not recognized, even using MU editor (I developped everything using circuitPython and I would like to use the same configuration with my board ; drag and drop files is pretty convenient...)

I check all pins : voltage levels and pinout (including USB) is correct.

I tried to tie down RUN / CS of the flash but nothing changed

Is there a first flash to achieve using SWD ? Like for installing a kind of USB bootloader or anything ?

Anybody can help ?

Best

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https://www.raspberrypi.com/documentation/microcontrollers/c_sdk.html#blink-an-led

and

https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf section 2.8.4

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