got at games 2019 atari portable

[got at games 2019 atari portable]

I've put them in a folder called game, and the instructions say I need to hook the unit to a pc and copy and paste a file called firmware.bin onto the root of the sd card, I don't have a pc so I can't do that

[got at games 2019 atari portable]

So I just got an at games atari handheld portable, and I cannot put games on the sd card.  It doesn't recognize it.  I click on the card in the menu and tried to look for it then just goes back to the menu.  The instructions say I need a file called firmware.bin, but I don't have access to a pc so is there anyone else that might have the file I need or any ideas.  I just have my phone