TinyFPGA BX Timeout when connected to computer


I started recently with the board, and I managed to load the SOS example following the guide. Everything worked flawlessly.
Now I’m trying to load new designs, but the bootloader timeout like 1s after plugging the board in the computer.
¿Any idea?

INFO: OS is Manjaro Last version. I tried in Windows and it seems like there the problem doesn’t arise (I guess maybe its something about how Linux/Manjaro manages serial ports, but dunno).