Please, help. LG G2 D802 Full Brick and no way to fix it...

It seems taht the OS has been uninstalled due to a...ehm... bad use from my side. ok.

I do only can enter in recovery mode (TWRP) but in can not install any ROM, neither with sidelload nor flashtool etc... Even the computer can't recognize my device although I have tried with different drivers... From what I have read, I have only seen that the only solution is through Ubuntu, but I don use Ubuntu...

Can anybody tell me a solution to fix it please? Please note that I am not an advance user...

THANK YOU VERY MUCH IN ADVANCE