[Ulefone Metal 4G] Bricked / Dead or ?

Hi,

I am posting here for the first time here, even though I have been following and enjoying XDA for many years.
But for now I am looking for some advice/help to troubleshoot the phone of my child
and here are the details you sould know about :
- Phone model : Ulefone Metal 4G (not the Lite version)

- Problem description : Screen is black and nearly nothing is responding... no back light, no touch response, no led/screen while charging (usb to pc or direct charging).
This happened after plugging the phone on my car to charge and at that time the phone freezed on the ulefone logo screen, but never made it to the android interface. we then stopped the phone by pressing power a long time, but since that time the phone looks like dead.

- What I have tried so far :
~ start in recovery mode : by pressing VolUp+Power, I managed a few times to come to a screen with the following options
===> recovery
===> fastboot
===> normal
this is my only hope and the reason why I am asking for your help, but sadly none of these options are working and each time screen goes black after pressing the VolDown button to choose the option.

~ since I had this screen, I thought the problem might be with a corrupted partition (bootloader or any other needed at the beginning).
so I followed the steps to get the phone connected via USB and use the SP Flash Tool (I read both XDA posts and this one )
I installed the drivers, downloaded the TWRP recovery to try with something and so far so good I am all set to flash...
but when I start the process with "Download" and then plug the device.... NOTHING happens, the phone is never recognized.

~ I also watched some videos on how to disassemble the device, but I would only do that only if this my last chance.

This is where I am stucked so far, and right now I can't even go back to the "boot" screen with the 3 options.

Anybody already had a similar experience on this phone (or another one) ?
Any idea what I can try to troubleshoot ?
Any hope for the phone ?

Thank your for your help

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