Hello guys, if you want to unlock bootloader on Xiaomi Redmi 8 and install TWRP, you can do that in official method. Even the TWRP custom recovery supports Redmi 8 officially now. You can flash the Magisk Package as well in order to Root Redmi 8 quickly.

I got a detailed guide here: https://droidfeats.com/how-to-install-redmi-8-twrp-and-root/

Check it out and install TWRP on Redmi 8.

And if the bootloader of your Xiaomi Redmi 8 is not unlocked, you should try out this guide first: https://droidfeats.com/how-to-unlock-bootloader-on-redmi-8/

Once done, you will be able to install all the apps that need root access and flash a lot of custom ROM available in the XDA Developer forum.

Try this guys. You will be surely amazed.