OMNIA "PDA Device Not found"

[Guest Stefan_SRB]

Can some one help me I have OMNIA PDA: i900DTHJ6/M2D02

Phone: i900XXHJ 1

And I want to upgrade it to Originall OMNIA Sowftware,LATEST! When I try to upgrade it it SAYS PDA DEVICE NOT FOUND...I am using Vista Ultimate x64 but I have all newest programs such as USDL GP 1.6.1 VISTA,and I dont know if I have latest PDA,PHONE,LOADER,CSC I have i900DTHJ5 ROM! Is it originall and is it latest! If not tell me what to do from begining...I read all about flashing and other stuff but,,,,,,,no LUCK!!!

What should I do???

REGARDS B)