G4 stuck in bootloop !

Hello,

I'm having a really bad situation with my G4 (H815L),
My new UNROOTED device just decided to enter a bootloop, I tried to make a factory wipe but it got back into bootloop,
I tried to flash a stock firmware with the flash tool but again it got back into the loop.
Tried to find a TOT files for this version but I couldn't find one. :(
Does anybody have a solution for this ?

Thanks.