I am trying to run ROMs from my USB. I try to follow the guide, however once in retropie setup/configuration tools, I can't find an option "Enable the USB ROM Transfer Service". I tried looking for this issue, but can't find a single topic. I have 4.4 version, did script update, even did Kernel update. Nothing seems to help.
it looks like you need that particular
optional package, which I think that it's not auto-provided with a basic install.
So, ensure you have an internet connection (not sure if that's necessary since I don't know how RetroPie manages its packages / repos / files) and do the following:
Manage optional package
Scroll the list until you find the usbromservice package. You should be able to install it using the menu and after a reboot you should see it in the
Configuration / tools menu.
Please consider that this solution may not be that accurate and probably already exists on the web. I just shared the steps I made to reach my goal. Enjoy!