URGENTLY NEED HELP, PLEASE HELP ME GUYS WITH A DEAD w810i

Hy...
my problem is simple ... the phone is completely dead.the phone was brand new, somewhone tried to flash it... the phone died and i bought it from that person because i have am USB-SMART dongle and i hoped that i would make the phone running again.

I tried to flash ... the problem is simple... in any program i try, it says, Error RECOVER CERTIFICATE.For that matter, i cannot flash, i can't do anything to the phone.I tried with test point, il detects the phone when i try whith test point, it's a cid 29, but when it sends the flash it gives me an error.
I've searched the internet but nothing helped... PLEASE, help me with an advise ... or something.

Thank you, my regards, Ionut

post up a xs++ log, and also what happens when u try to turn the phone on

the phone died sudently... nowhone tried to flash it or unlock it, it just died.I didn't use XS++.What should i do ?What do you need from the phone ?

Ps.the phone is completely dead, it does not power on.

Take it to service center. I think this is only option.

Nice day

i am the service center:) i have SeTool original, with box, but with no result.i tried... nothing.any other advice ?

Try Updating Your EROM Using WotanClient And Press 2+5 Instead Of c When Asked.

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first have your battery checked by charging your battery in your friends same model phone. If the battery gives u it is good, then collect the required files of your phone model to flash which is available in to sony download area, I dont have acess to download area and top sony strictly restricts file sharing, just read the rules. try getting xss++ 3.0 in se-nse sites, but remember if there is corrupt gdfs u need to have multiserver cable to unlock. Important, before flashing, have ur battery fully charged. Read tutorials from topsony relating how to flash. After flashing main file in xss++, check if there is light in screen by booting phone, or in infrared ligt is blinking to know your phone hardware status. If u find this post helpful please don't forget to press thanks button. Good luck