There are 4 links in my signature. Click the one that says "click here for linux commands".
Here it is again
I don't know what you meanCode:https://www.world-of-satellite.com/showthread.php?40948-How-to-use-Putty-for-Unix-Linux-commands
Forget the command line. For time being, please follow the USB flashing guide. Try a different USB stick, max 8GB, make sure it is fat32 etc
You can download openATV images from here
Code:http://images.mynonpublic.com/openatv/current/index.php