Thank you for your guide.
I’ve stuck because scatter file doesn’t work for me and I don’t have Windows machine to generate my own.
I’m using Fedora 28. Phone is detected – adb shows:
> adb devices
> List of devices attached
> F120190112343434 device
Scatter file error:
SP FLASH TOOL ERROR: (8417)
I hope there will be more straight forward procedure in future.