Help with 3G over 2100Mhz topic

Hey, I need help running 3G over 2100Mhz frequency on unlocked Tmobile D415, Ive tried using both these codes to enable 3G over 2100 and its not working:

3845#8415#
*#*#4636#*#*

I read some where that T mobile offers a rom for europe and asia where 2100MHz for 3G is enabled, any help please?