Device not detected in fastboot | REALME 3 PRO
you can access your phone with fastboot command.
try fastboot devices in cmd and it will show connected fastboot devices.
you can see full command list with fastboot --help
if you want to install twrp, you need to enter the command:
fastboot flash recovery &lt;your twrp image file&gt;

but i think you need to unlock your bootloader first.