Redmi boot screen in Chinese - help

All of sudden when my 'Redmi Note 9' phone was restarted, I somehow landed on a bootscreen menu which is Chinese language. Volume Up key is apparently not working on this screen. And I cannot exit to normal bootscreen. Please help . ( Whithout knowing Chinese, I pressed for third last option containing "**eMMC" and I almost fell unconscious seeing the message "Bootdev is busy, Can't format" )