bricked phone

Jan 21, 2016
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hi . one of my cousins gave me his phone to repair(sony is not supporting our country so he gave it to me) so i read couple of guides and moved on .
i tried to get to flashmode ->pow+vol- and a green light blinked and device turned off and blink and 10 sec later blink and...
and now i cannot boot into system normally ,every time i turn device on or connect charger green blink happens again.
fastboot works but pc dosen't recognize device (u cannot hear any sounds and i even tried in linux which dosen't need any driver ).
i disconnected battry, used tiny yellow key ,and pow+vol+ .
so any idea or i should throw phone away?:confused: