I’m pretty sure that you don’t have to flash the electronics before use. Mine came ready to print.
You just need to install a slicer program on your computer like ‘Cura’, ‘Slic3r’ or ‘Simplify3d’ (this last one is not free but really good).
If you want to print from your computer you probably need to install some drivers, allthough i always print from micro sd card. Then no computer is needed.
Just slice your model and export it to the micro sd card (formatted as fat32 on a windows machine).
Plug it into the sd card reader of your printer and turn it on. In the menu preheat your printer and when the temp. has been reached go into the menu again and choose print from sd. Choose the file you sliced and it wil start.
Ofcourse you need to make sure that your bed is at exactly the right height and level. But that is covered in many videos and tutorials on the web.