And this is very old image thas was ment for old series of those GPUs but we do not support it anymore. Yet it supports 300 series but i think except 390 - so image above should be best for your case. https://download.simplemining.net/images/SM-4.2.0-R-v1252.img.xz
that's the image that I used
i'm going to try other usb pen
do you think that it would boot better from a ssd/hdd?
Maybe pendrive is broken ? Try SSD if you can erase whole drive
Also can you post screenshot of your error exactly ?