No signal when finish Upgared !

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thanks everybody!
I have download Special... v1.2
I run on T-mobile very well.
But signal of my network where it gone .
No signal.

i use my Net work Mobifone in Viet Nam GSm 900
So how i can for my device run as well as first time in USA.
Please help me soon.
Best regads,
Khoa D.D.

My radio version 4.2 ( i had download RUS of O2 on T-Mobile )
T-mobile have Radio ver 6.2 . Does it have any problem.