HTC Desire 820n failed RUU update, nothing work - Desire 820 Q&A, Help & Troubleshooting

Hi i have htc 820n.Phone start in fastboot and says "Securty Warning" "Locked" "Software Status: Modyfied". I tried flash stock rom RUU by sd card and that failed with "device halted due to large image update". When i pressed power button to close this message phone shutdown and now there's nothing. Not recognized by PC, no fastboot, keys combinations do nothing. Only thing that phone doing is slowly blinking led with orange color. What can i do with it?
Sorry for english
@edit
Phone is recognized by PC as Qualcomm HS-USB QDLoader 9008

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I purchased this phone in a wholesale lot. It powers on and is recognized on the computer as "Qualcomm HS-USB QDloader 9008" after installing the USB Host drivers. The screen stays blank, and QPST is telling me that the phone is in download mode (Q/QCP-XXX).
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desirezbilal said:
i have also bricked my desire Z by installing incorrect Hboot, now its not turning on, volume down+power combo not getting me to the bootloader, its not even recognized by my computer, i have also installed QPST QXDM, what did you install to get your phone recognized by your PC
Click to expand...
Click to collapse
you can try getting to hboot by doing trackpad+volume down+power
evilcuber said:
you can try getting to hboot by doing trackpad+volume down+power
Click to expand...
Click to collapse
i tried but that's also not working

"Secure booting error", D855

Hi,
so i recently got a bootlopping LG G3. My first thought was to just flash a stock rom - So i did. But as LGFT was flashing the USB cable accidentally plugged out and now i'm stuck at
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I tried using FlashFire to flash a zip and my device now seems to be bricked. The screen is stuck black and when plugged into the computer, it shows up as "Qualcomm HS-USB QDLoader 9008" which means I can't get to even fastboot to use the unbrick tool.
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HTC Desire 820n Bricked (probably Hard)

Hi
I buy HTC Desire 820n (single sim). Phone start only to fastboot with comments "Securty Warning" "Locked" "Software Status: Modyfied". I try install  0PFJIMG_A51_UL_M60_DESIRE_SENSE70_MR_HTC_Europe.3.17.401.3_Radio_01.01.010_U10305041_08.01.50512__Hboot.zip with Sd Card. After end installation i push power button but after that phone was dead. When i connect to PC is visible as "Qualcomm HS-USB QDLoader 9008", orange led slow blinking. Probably i hard bricked this phone What can I do now to repair this phone?? PLease Help

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