There is no official, one-click, free tool from Huawei. Any "new" method involves third-party software or hardware manipulation.
With an unlocked bootloader, you can:
No. Unlocking only removes the restriction. Installing a custom ROM is a separate, subsequent process. huawei nova 5t unlock bootloader new
: Install Magisk to gain administrative root permissions. There is no official, one-click, free tool from Huawei