Hey, here’s a post with a similar question:
  
  
    Hey, I’ll just put a quick step baby step flashing guide up. https://www.balena.io/etcher/ 
Once you have the program, select the image you…
   
 
There is a link further down in the post given by @guu  with a custom 0.4 image that will auto expand to take up your entire SD card.
@Rebusmind  made a great custom 0.3 image with extra emulators. They provide instruction on how to expand their image, along with how to set up a few other important bits and bobs.
  
  
    Hi everyone, 
as discussed in other threads, I was thinking about taking the base OS image and add the standalone emulators so that newcomers can get most systems running with improved perfomance by just adding games (and the odd bios file). 
This is purely aimed at people that just want to emulate games without tinkering with the system too much. It is still advised to get acquainted with the system itself if something goes wrong some time in the future. 
I’ve tried to keep changes to the image…
   
 
Hopefully you’ll be back and running soon!
             
            
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