Arduino Nano 2040 Connect doesn't work anymore

At first, all seemed to run perfectly. I tried to install CircuitPython bootloader on my nano rp2040 following the adafruit tutorial (Install CircuitPython | CircuitPython on the Arduino Nano RP2040 Connect | Adafruit Learning System), but it didn't work: after dragging the .uf2 file onto the RPI-RP2 drive, nothing happened.
In addition, I accidently tapped twice on the reset button another time, after that the folder appeared. Result: the board doesn't give any sign of life. It isn't even recognised by the computer when I plug the USB in (tried with many different cables)!
Can somebody tell me what I've done and how can I fix this disaster?
Please help me!

Did you use the 'nuke' UF2 first before loading in the Circuit Python?
Also you have to go to the next page to install the Mu editor, which is a pain in the a**, because it is over pedantic. It will complain about things that do work and notlet you run the code until you "fix" them. I use one called Thonny it is much better.

No, I haven’t used the “nuke” at first. Should I have? But now I cannot even do that, because the board USB doesn’t connect anymore.
I also read about installing the Mu editor, but I thought of doing it afterwards…

It is always wise to do this to clear out the memory of what the Pico used to contain.

As it is the way you communicate with the PICO in python mode so not much is going to happen until you do.

Did you ever connect anything to the PICO?

So that was the folder you were supposed to drag a .uf2 file into.

Are you on a PC or Mac?

If it is a PC then it might be stopping things. Have you done a full reset on the PC?

I installed it and tried to configure the pico as interpreter, but nothing happened: the problem is that my board isn't recognized by the PC (I don't have a mac) at all!
I did connect eletronic parts to my pico, why?
Do you think I should try with a mac?

Because if you did, there is a good chance that is what caused any damage. The PICO is a 3V3 system. Connecting anything that produces more voltage than 3V3 is very likely to damage the PICO.

So what exactly did you connect?

I don’t think you understood my situation. I know that i mustn’t apply more than 3.3v on its pins. The problem is, that after tapping twice two times on the reset button the board seems to be broken. Assuming that I it isn’t due to the static electricity of my finger on the reset button, what could have been the problem and how can i recover my board?

I can assure you I do. I am a regular user of the PICO.

Tapping twice is no difference than tapping once on a PICO. The double tap is only used on systems that have the 32u4 processor on it or on the Uno R4 processors.

Have you looked at the connected USB devices on your PC? There is a window that shows that somewhere, but as I say I don't know about Windose.

Maybe you could say what OS version you are running along with the IDE version you are using. Then maybe some one would come one who has that OS could help you. Remember we only know what you tell us.

Have you tried holding down the boot loader button on the 2040 while you plug in the USB socket. Then release the boot loader button.

It is a fiddly thing to do but it might just make you see it again.

Maybe it made a difference because my board is an Arduino RP2040 and not a PICO?
I've already looked in the windows (my OS) control panel, but after plugging in the board, my PC didn't recognize it at all. In fact, it didn't even noticed that something has been plugged!
I tried to do as you said, but nothing happened this time too.
Thank you for trying to help me and for the time you spent on this topic.
I suppose that I need to say goodbye to my board, and give it a funeral.