Don't know if this is where I should post this, but I had the issue where 1.9 wasn't working with my Elegoo Saturn s. I update firmware to 4.5.1 and still didn't work. Made sure to format the USB again and nothing. The files were there, but were unusable just a picture of a file. Finally I went into chitubox and I had a pre load profile on chitubox. So I made new one for the Saturn s, exported the default profile and uploaded it to the Saturn s profile. After that I sliced in cbt. format and it showed up..... only took 3 hours to find out.... don't know if is gonna help anyone just was a journey and trying to save someone!