d821 error in flash
 

what it can be?
downloaded firmware support

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Hello.

What is exact state of the phone? Why did You decide to reflash it?

phone're caught in logo

Try to reflash the phone using "nexus 5 root software" Software from "lg/for unlock and repair/" folder of the Support Area. To enter Support Area, press "Go to support" button on "Support & options" tab of the Software.
Try to write original firmware via original flashing tool.

If problem with writing of firmware will persist with these two optional methods, then, most likely, your device has HW problem.

I will try this procedure
but the phone was calling
after manual reset was caught