Accept the solution by clicking on the 3 dots on top of my comment, so that it will be helpful to others too.
And if they say no solution then you have to buy new smartphone because motherboard has corrupted due to update.
Many many m30s, m21, m31 owners has faced same issue from past 6 months and it costs Rs 7000 to change motherboard through official samsung repair shop
Tell me what local repair shop says.
Also read my name 🙂
Dear Samsung Member,
Greetings from Samsung Customer Support!
We acknowledge your query and apologize for the same. 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