Default [Q] Bricked 8S with FS-access

Hi, wanted to downgrade from 8.1 back to 8.0.
Downloaded UEFI_signed into SD, and got a brick.
PC's Device Manager says there is a driver for QHSUSB_DLOAD needed.
But in Explorer i've got a new volume.
Is it the FS of Windows Phone?
I've copied it with UltraISO into *IMA-file.

How can I unbrick my device?
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UPD: Installed Drivers, got qualcomm hs-usb diagnostics 9006