phone died topic

I was playing the best friend game. then after closing it was updating the ola cabs app.
while doing so the phone go slow and reboot. after the rebbot it showed andorid upgrading. the ola app was upgrading again but phone was slw. then it turned off. after that its stuck with boot loot.

I am using stock android and boot loader isnt ulocked not rooted.

plz help guys..