Default Cannot update Desire Z from bootloader - stucks at "BOOTLOADER updating..."

I am trying to fix my bricked HTC Desire Z and started to install stock RUU from bootloader.
The problem is, it stucks at BOOTLOADER Updating - 15 minutes is definitely too much time. I've tried other RUU - same.
I can just suspect the problem with RADIO, because I flashed other one before, but I don't really know which one is correct now.

Look at attachment.
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