So to everyone here. After updating to 6.0 I don't think it's a good idea to downgrade to 5.0.2 and update it with stagefright update over the air.
I made it and it hardbricked my phone.
5.0.2 bootloader version is 48.83
6.0 bootloader version is 48.86
So, don't downgrade your bootloader, it can cause hardbrick!
