Xbox 360 not recognizing user profile

I have a couple of Xbox 360s, one of them got the RRoD and I decided to swap the hard drive to the other Xbox, that Xbox recognizes some of the profiles but it doesn't recognize all of them (more specifically, the profile in which I have my saved games and DLCs). Both of them are running the same OS (2.0.17349.0) and their specs are the following

A Falcon V2 (Mfd: Sept 2008) flashed to L.T. 3.0 - This one got the ring of death

A Jasper V2 (Mfd: Sept 2009) This one still works

What should I do to make the Xbox recognize my profile?