Please help i have rebooted oppo a15 to meta mode after disconnecting the phone, it's just stuck on mtk port tried holding 3 buttons power+volume up+down but it's not getting on. hold power button not getting on both umt and cm2 showed error failed to initial meta mode. but i checked phone started to meta mode with blue screen. then i turned on phone by pressing 3 buttons it's went to recovery mode from there i select reboot but phone not booted it's stuck on mtk port. during this process i didn't disconnect usb cable from my pc. also i tried flashing with mct dongle , cm2mt umt all shows error failed to initialize brom. i tried to power off on but phone is stuck on mtk port. i don't want to open cover of the phone to disconnect battery. what should i do?