AmineHL

Hello there. I own a Z3 model D6603. It is unlocked bootloader and Before it had got the bootloop i had Lineage OS 16 custom rom installed on it (Android 9). I was watching some videos on chrome and then the phone heated a little and then restarted. I thouhgt it was maybe some sort of instability but then it started just bootlooping.
Current Status right now is :
Once connected to pc goes to flash mode.
I can get it to fastboot.
When connected to charger just goes into endless bootloop where only SONY logo appears and then quickly restarts
In attempt to fix it I flashed stock FTF using multiple versions of Flashtool which was fruitless. I also Tried with EMMA but nothing helped still. And then after looking I think it might be damaged TA and I've seen so many say that if that's the case then the phone is bricked forever unless you have had a backup from a previous working state which I actually do. The problem is that I don't know how to flash this TA back since the phone doesn't boot to restore it through ADB. I saw that S1tool works with older devices and doesn't work with Z3 models so I wonder if there is a way to fix this. Thank you for your time.
PS : My power button doesn't work I used to use fastboot to boot it when necessary
that's the TA backup I have I hope it helps anyhow