I need to update my PS3 but don't usually have it connected to the internet. Is it OK to just install the latest update via USB and skip previous ones? I know this is a no-no with a PC. Thanks!
Updates are cumulative, so the latest update will include all that the others did - and more.
Not sure what you mean buy "It's a no-no with the PC". It's perfectly fine to install a PS3 firmware upgrade with one downloaded on the PC via a USB stick.