In the time of purchase this phone had develped ROM, bet after some hours some issues appeared - system hanged, phone tried to restart, but stuck in the middle of restarting. I had to remove / reattach the battery to get my phone working, but soon it hanged again.
Then i installed Leo_RADIO_2.12.50.02_2 and Duttys_2.5_5.23126.96.36.199_3.14_HD2_ML_Family_ROM_( V6)_WWE from SD card. Unfortunately this doesn't solve the problem. So i installed original software (T-Mobile_HD2_MR_Software_3.14.531.1.exe), downloaded from t mobile web site, but the issues remains.
Now i don't know, how to solve the problem. So please help me somebody (i'd like to use developed ROM). I guess, i have to format phone with MTTY? And to install developed ROM, i need to reinstall BIOS?