[FrozenAngel91]

Yeah I play PIU prime a lot, so I should be able to answer these questions.

First of all if your machine says offline, then usb's wont work at all. All you're really doing is storing a passcode on your usb so that it can then access it's servers to find your account, so if it's offline you're not gonna get anywhere.

If your machine does come online, which I hope it will, then here's the answers to your other questions

The type of USB hasn't particularly mattered for me, and neither has size. Ive used a 32 GB USB and it's still functioned fine, so that's probably not a problem. I usually use sandisks and those always work, so you can go with that if your not sure your brand will work. I've seen lots of other brands work though so your probably fine.

As for prime.bin, yeah that's exactly right. Just move that to your USB, and don't put it in any folders in the USB, and you should be good to go. Make sure if you download it more than once that the file is always labeled prime.bin, not prime(1).bin or something.

Anyways hope that helps, if you can't get online it's not so bad, there's quite a few good songs on there. You'll never have to hear people spam bad apple, so that might be good, or bad I suppose depending on what you like haha