NEED HELP going to 1.13ROW 1.28FW

right now my setup is..

unlocked CINGULAR

with now..
firmware: 01.23
software: 1.06/5052/0..

ive tried to hotsync the "44" files to t650 on many accounts
but i cant get the upgrade to work.. is going to 1.28 even necessary before going to 1.31?

i would like to make the fone UNBRANDED/GSM with the exception of the cingular on the outside of the housing.
any insight would help. thanks in advance