How can I flash it on rpi pico/convert to uf2?

[nivInsanity]

Hi,

while trying to flash with esptool error is appearing:
"esptool.py v4.3
Serial port COM4
Connecting......................................

A fatal error occurred: Failed to connect to Espressif device: No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html".
No success with ubuntu too, is there any other way to flash it to pico or convert firmware.bin to firmware.uf2?