How can I fix my bricked phone?

[plast 0000]

phone bricked (sort of it)

I tried to get back to Windows Phone 8.1 from Windows 10 tech preview Build 10080

when the installation process began with Windows Phone recovery tool, it told me that the installation failed
it told me to reboot the phone, I did but now it shows nothing

the phone is detected by USB, it shows: QHSUSB_DLOAD

UPDATE: I fixed it
here's the way in case someone got in a similar situation

https://sujitintel.wordpress.com/2015/05/08/lumia-520-bricked-here-is-100-working-fix-for-all/