If you have the official firmware (Stock ROM) files, you can flash them without a PC using a USB drive.
A flash file, also known as a firmware or ROM file, is a type of software that is used to update or restore the operating system of a mobile device. In the case of the Huawei Nova 5T, a flash file can be used to fix software-related issues, such as bootloops, freezes, or even device corruption. nova 5t flash file fix