Destroyed system of L820 - bricked (?)

[Cortanapl]

Hi. I was trying to unlock a bootloader by Windows Phone Internals. Unfortunately, somethink goes wrong. Now when I'm pushing Power button, there is nothing. There isn't Nokia logo, only black screen. What should I do? Can I rescue my Lumia? Can I restore a bootloader? Or should I replace Motherboard? Please, help me!

 

[Maurizio Troso]

Hi. I was trying to unlock a bootloader by Windows Phone Internals. Unfortunately, somethink goes wrong. Now when I'm pushing Power button, there is nothing. There isn't Nokia logo, only black screen. What should I do? Can I rescue my Lumia? Can I restore a bootloader? Or should I replace Motherboard? Please, help me!

Did you tried the hard reset key sequence?
If yes, Search google for Lumia Care Suite and relative guides. Good luck

 

[Cortanapl]

Could you send me a link into that guide, because I'm not so good in English.