Pretty soon those bellend hipster web administrators will be giving us full on Voight Kampf tests (which I wouldn't mind, because the one on Bladerunner 2049 looks like tremendous fun, almost like jazz scat).
connect ur phone with Data cable
open terminal and type these commands...
Sudo Adb devices
4.adb boot bootloader
and download twrp img for ur phone and flash it
fastboot flash recovery ~/path-to-twrpfile
fastboot boot recovery
and then after opning ur recovery u got acess to ur phone Storage.. So make a backup of this thing on PC
WIPE ur phone