Which gearbox is in my car? BMW E61 530XD 2010

Hi! I have a concern about which gearbox is in my BMW E61 530xd 2010, i've tried doing some research because i wanted to verify that i had the 6hp28(x) but now that i have done some research, im not so sure anymore. Some people say that the xdrive versions kept the 6hp26 even for the lci, althought i've found forums which claim the opposite, but then also it feels weird that in 2010 they would stick a 6hp26 in a 5 series. Im looking for someone who knows for certain as this is pretty confusing.