The FW that fixes the 24P bug is not available online for auto-updating from your AVR. You must download it from the Onkyo support site. If you are having trouble finding the many posts discussing the subject go to the link at the top of the page that says "search this thread", click it and type "24P firmware".
Yes i know i must donwload it. i have it on my usb now but i dont know if i dare upgrade to that one as my receiver seems to come with the one u request via email.