Press and hold power + vol down and Switch to vol up as soon as the screen off,
Ps: don't release power off button during it
Also should be connected to pc.
Dear Samsung Member,
Greetings from Samsung Customer Support!
We request you to kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
Thank you for writing to Samsung.
Samsung Customer Support