Is there a way to flash the ESC's with BLHeli S firmware via Command Line

[krupis]

I am aware that you can perform initial flash of the BLHeli S firmware to the ESC's via the BLHeliSuite using Arduino board with 4way-if firmware via C2 interface.

I would like to know if there is a method to flash the BLHeli to the ESC's via C2 interface using command line tools? Perhaps a python script or some other tool that would allow flashing of the ESC's without relying on BLHeliSuite for first time flashing?

The only relevant post about this I have found is below:
https://fishpepper.de/2017/02/21/tinypepper-initial-blheli_s-flashing-tutorial-using-the-efm8-bootloader/

The post describes flashing the ESC's with a new bootloader via Serial interface using command line tool. Is that the only option ?