The modchip Picofly V1 is 20€ on taobao and the chip Hwfly v6 Oled is 13€.
And it looks like they added an increased current protection chip (to avoid burning the motherboard),
Picofly V1
Hwfly V6 oled
yes it works well with ubuntu, I just tried with a rp2040 zero and I got the firmware "test.u2f" with this command:
sudo picotool save test.uf2
I used this tuto to install picotool correctly:
https://jamesachambers.com/getting-started-guide-raspberry-pi-pico/
or hope v3s without usb port are under spacecraft v2, has anyone here ever received the version without usb, could they tell us which version of spacecraft does boot0 contain?
you can flash the mcu by soldering the programmer directly to the chip, i have used this method several times with sx chips but not yet tested with a hwfly: https://www.sthetix.info/unbricking-the-tx-lite-and-tx-core-modchips-updated-version-easier-to-do/