[Q] HELP PLZ.. I MESSED UP BOOTLOADER of LUMIA 800

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Hey Help needed instantly

I have qualcomm bottloader ( not now ) of lumia 800. I restore Nokia DLOAD from qualcomm successfull but phone does not boot even not vibrates.
I tried nokia care suite for dead phone flashing but always says CONNECTION LOST TO DEVICE .

How can i recover bootloader or flash a ROM ?

Thank You.