How can i fix my softbricked g3?

[AC Question]

Hey, so i have an lg g3 d855, and i read all the treads in this forum, but i can't make it work. I had a g2 before but that phone is completly wasted now, my friend gave me his G3, and it's on bootloop, after the phone frooze for no reason and turned off.

So i literally tried everything i can.
First of all i tried LG flash tool, with the original .tot file and the d855 dll. This one does nothing. After pressing the yellow arrow, and plugging in the phone in download mode, i got a "model information check ERROR".
hxxp://i.imgur.com/XzqYOnl.png

(note: i plugged in a 2.0 port, and i have the original lg driver: LGE ANDROID NET USB SERIAL PORT at com41)
hxxp://i.imgur.com/mTHRWJg.png

After this i tried LG flash tool with the lg g2 dll , i read that in this forum too, and something happened. it started the procedure, the phone is recognise the com41, doing nothing still at 0%, but at 6% (in the computer) it stucked with the error : "we can't communicate with phone [KILO packet]" or with "LAF read GTP failed".
hxxp://i.imgur.com/iA7b5Ht.png

Then i tried the lgup, i got the same error message: "we can't communicate with phone [KILO packet]"
hxxp://i.imgur.com/e3wKbLx.png

And i tried the LG flash tool 2014 with .kdz and it stucked at 4%.

I don't know what else can i do , or what i did wrong, i searched every forum i found but nothing :/ Pleas somebody help me, this is impotant for me.
Also i have a .log file if it can help with troubleshooting.
I changed http to hxxp for the screenshots.

 

[Golfdriver97]

Welcome to the forums. You may need to consider a JTAG. This can force software back on to your device. However, if there is something wrong with either the USB port or the internal storage, this probably won't work.

 

[noszkih]

Welcome to the forums. You may need to consider a JTAG. This can force software back on to your device. However, if there is something wrong with either the USB port or the internal storage, this probably won't work.

ok, i just did that and my phone ran to a kernel crash

 

[Golfdriver97]

Can the device be at least connected to a PC? Maybe this got it to where you can reflash the stock ROM?

 

[noszkih]

Yes it can, i tried to fix it with the stock rom, but it ran into kernel crash, after that i tried some more different rom, but none of them seems to work :/ Is it dead ?