Now I tried like 10 different atr images with large games from this page (Goonies, WCC, Abbuc etc) and all crash. Some of them crash at 3 or 6 bank, but never more than 7. I made my own atr with 8kB roms, it also crash at 7 bank, but first couple games run anyway, it is because those games are short and were flashed succesfully at the first 6 banks. So I think cartridge is damaged then
Any way to repair this?