when i tried to turn on my phone it shows YU logo and then automatically turned off..........when connect my phone to pc via data cable to pc or charger it automatically goes to fastboot mode.......I tried to flash stock firmware via fastboot mode but it says your device is locked .......when i tried to unlock the boot loader(with this command: fastboot -i 0x1ebf oem unlock) it says error: Unable to format the system.so I tried to boot into custom recovery via fastboot mode (fastboot -i 0x1ebf boot recovery.img) it shows file is not signed then i tried to boot into lollipop stock recovery....It booted successfully ...then i flashed tomato signed stock lollipop rom from stock recovery...it shows the flashing progress but appears yu logo then automatically turned off........now what should i do.......? plzzz help.
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