If you already have .img files for flashing into your phone, you can simply create config.txt file for using it on DC-phoenix
Begin by creating new text document. In directory where your .img file(s) are placed right click on empty area, select "New", "Text Document"
Rename created file to "Config"
Open the document and write in manually partition(s) you want to use for flashing same way as in picture below
Download DC Phoenix software here
Launch the program
If there is no DC-Unlocker/Rocker/Vygis or Infinity dongle connected to PC, then log in screen will appear. Use your account details to log in, otherwise you have a possibility to access software with free account that will allow you only to detect device
How to get Username/Password check here
DC Phoenix software window will appear
Select "Fastboot mode", open "IMG files" tab and click on paper icon next to Update file field
Select "Config.txt" file that you jst created. Click "Open"
Review files prepared for flashing on software window, if everything according to your needs can click "update" button to start flash process (Note: phone should be connected to pc in fastboot mode before pressing Update).