Remove all rgn from your folder 2x5W rgn and add only one rgn file beside updater.exe and try flash if this will work, maybe to mutch rgn create your problem.
Do you try this on win7 x64?
Try another pc with xp or x86 system and also try to change usb cable.
p.s.
You can also try turn off and on again your Pc if then work.
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