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Hello, i have X performance Single Sim Docomo unlock
when i got it, i tested and it was normal at the first time setting screen until i locked the phone and it couldn’t be woken up, even i forced to restart and shut down, the device could boot normally until entering the software, but just in few seconds after done booting, the phone slept by itself and couldn’t be woken up even with power button or camera button still no response from device, but the charging response is normal
the seller said bootloop because failure of flashing software, so i tried to flashing it manually using flashtool but not given any effect, using xperia companion is same no difference, even i downgrade the software to marshmallow still no difference, what could it be? (bootloader unlock possibility is NO)
unlocking the bootloader won't solve the problem, and it seems that you've done everything on your part to fix it; it seems to be hardware related rather than software. You should contact the seller and/or Sony directly regarding this.