Default [Q] Why does my Htc desire hd not support 2100mhz??

I bought htc desire hd. I rooted the phone and updated it to Jelly time 4.2..2.Radio version of my phone is the problem is dhd is not supporting 2100mhz and since I'm from India I need 2100mhz band to connect to 3g. When I dial *#*#4636#*#* and open select bands, it shows 850,900,1800,1900 and 2000mhz.There is no 2100mhz while the box says it supports 2100mhz.Do I need to flash another radio?If yes give me the link.On eBay also they said it supports 2100mhz.Thanks to those who help.