if you used our app you should have your phone MSL (it's in our ap first screen after the unlock), try the solution of insanecain:
Dial ##DATA# (each letter correspond to a number, so dial ##3282#),
then tap EDIT,
then input your phone MSL
then tap MORE,
then tap HDR/1X Selection.
if GSM/UMTS isn't in the list then select GLOBAL and tap OK.
Let us know.