P.S. I use Google Translate.
Hello, I just received my Pico (order # PI465090). I start by trying to connect it with my Raspberry pi 4B 8gb which is running Debian and which is up to date, while following the instructions of the official Guide “Get started with MicroPython on Raspberry pi Pico”. I held the BOOTSEL button for 3 seconds, connect the cable, release the botton and then … nothing. Nothing will happen and nothing is detected. So I tried all the USB sockets on my Raspberry Pi 4b with my keyboard and mouse. I also tried plugging in a USB key to see if it would detect and everything was normal.
I then tried to plug the Raspbery Pico into my desktop computer which uses Windows 10 and the Pico is finally detected (for information, I used the same cable as when it was connected with the Raspberry Pi 4b). So since it is detecting I Download MycroPython in Pico with the .UF2 file and Pico reboot normally.
Then I try it again with my Raspberry pi 4b and I still don’t detect anything. I looked at Forums and saw that the cable could cause a problem, so I tried 5 different micro USB cables and still nothing.