Help help to Update HTC-Tmobile G2 Touch - OS update from 1.5 to 2.2

[damu]

Hi

any one help to update the OS forom 1.5 to 2.1 or later . am using the HTC T-mobile G2 Touch bought from Uk now am using that in INDIA . so can not able to get update from the tmobile provider how can i update

my mobile details
Firmware Version 1.5
-Software Version of your device (ROM version) 1.00.A6288
HTC- T- Mobile G2 Touch

Bought from UK
using in INDIA

Help to update