Realme C3 problem after unlock bootloader

[Android Central Question]

I have unlocked bootloader of my Realme C3 using ADB/Fastboot driver

after unlocking Select Boot Mode Screen appears but volume up/down selection does not work

You can say stucked on Select Boot Mode Screen no keys working

After pressing Power button for few seconds the system restarts normally (with warning Orange state The bootloader is unlocked bla bla)

All user data erased, need to set-up from start

Again Powered off and restarted in bootloader mode two lines displayed on screen i.e Unlock verify ok bla bla

Tried this process many time but same problem

Any suggestion please
Rizwan