downgrade bootloader HTC HD7 T-Mobile topic

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Hello Guys i have problem downgrading bootloader for htc hd7 it always stuck at loading .... after i put the phone to USB Mode
so what do you think guys ? what could be the problem ?wrong region rom ? or what ?

and also do i need Gold Card Tool for this ?

thanks

here is what i have so far :

1-SD-Card Fat32 +Card reader
2-Y-Cable
3-and i used this rom
RUU_Schubert_TMOUS_1.20.531.01_Radio_5.51.09.11a_2 2.31.50.09_Signed_SCHUBERT_RELEASE

and here is my HTC HD7 information

OS :7.10.8862.144
firmware revision number :2250.21.51202.531
bootloader version:5.12.2250.0(135916)

xda-developers


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