I am facing camera issues on 7.2.16.So as always i tried to access twrp via updater app to change the rom.But instead of going to recovery mode,phone only switched off.So tried to access recovery mode manually but nothing happened. I thought may be this rom doesn't come with any twrp.so i tried to install twrp via fastboot.But if i press power+vol - only fastboot logo appears and nothing happens afterwards.If i leave that in that situation, phone gets switched off.What should i do now?