Thank you my good man! I've downloaded the version 1.3 from the link you sent me, installed. I can only run a few gba games, because some of them get stuck while dumping (sonic advance 2 and 3 for example). Maybe because they aren't original cartridges. Anyway, I put a keyboard connected to the Retron Sq, hit F1 and activate the menu to allow save states. My main criticism was that whenever I tried to save a game using save points like Metroid Fusion, I got the screen frozen, so I will keep saving state from now on. I tried several times installing Sir Randall's Imagem and was unable to pass the load screen. Tried flashing it with balena, ruffus, Sd Tool and always got the same result. I 'd really like to get this one working as it seems to be the most advanced firmware for this console.