[Q] Xperia Z C6603 hard brick? [Help] topic

Hi guys. First post. Made an account after struggling to fix my phone.

Here's what happend.

Bootloader unlocked, rooted and flashed couple of roms multiple times with no issue. the last rom i flashed was Infected Rom 5.0.2 YUGA , worked fine. i tried to UV the phone but the UV app said that the kernel was not supported. now after reading that , i googled and found a kernel that said it was UVable and for 5.0.2.. (maybe i made a mistake here)

so i downloaded and it said i have to whipe dalvik cache and install via recovery. so i did that and well... the phone never booted afterwards.

When i plug via usb to pc , i hear the usb detecting sound and thats it. even in flashboot / fastboot mode, it just makes sound and thats it. no vibrations. no led. i tried power + volume up. etc. ADB cmd does not detect either.

:( battery was around 40% around that time... maybe that was the issue ? what are my options here.

i got it used and so theres no warrenty. is it done for good ? do i need to charge it overnight ? will replacing maybe the motherboard fix the issue?

please help. ive tried searching every where for a solution. :( :(