Good Day SailfishOS Community,
Just want to give you a follow-up in this issue.
I was successfully flashed my C2 phone. The process is easy and everything went as it was described. I used an arch-based distro for this process. If you are on Arch or and Arch-based distro and do not have ‘fastboot‘, which is part of the ‘Android Platform Tools’ known as ‘android-tools‘, just install the ‘android-tools’ in Terminal with this command:
sudo pacman -S android-tools
The entire flashing process will run smoothly then.
Thank you again to jovirkku for a good description.
Eve