Nokia Lumia 800 Dead after Reset EFS hot solution

Nokia Lumia 800 Dead after Reset EFS  hot solution

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Lumia which request unlock PIN code, i new in Best Software i conect phone by volume up and ticked Reset EFS and i press flash without flash files, phone power off and no more power on, i try more 10 sec power + volume up/down, put to charge but its absolutely dead. Any sugestions

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1-
Normally that not should happen.
Reset EFS restore EFS from copy and nothing more.
Probably - something wrong with FW inside or some other manipulations was done before.
Reflash phone

2-

removed battery put it again and phone alive, battery percentage was 45%, and please tell me if this is correct unlock procedure ?

Unlock Bootloader
Unlock
Relock Bootloader

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