I'm going to assume you D/L'd the rosters of
"Live" then since you stated you don't have any devices.
I'm also going to assume you updated the default rosters manually before you lost them.
Like I said if you save you rosters by a different name, you won't have this problem.
Try looking on your HD to see if you have any
"Online Rosters".
I can't tell you how to get your old rosters back.
The only way I can think of is to do them manually again.
Or try and fine them in someone EA locker since you have live.
Sorry bro.