A: No such file exists. You can check Huawei’s official firmware database – enter "Y9s" – you will see only EMUI 10 and EMUI 12 builds.
Users often see clickbait videos or articles claiming to have "EMUI 13 for Y9s." These are almost always: huawei y9s update emui 13
The Kirin 710F chipset uses a Linux kernel version 4.9. Android 13 typically requires a kernel version 4.14 or higher. While backporting is possible, Huawei would have to invest significant engineering resources to write new GPU, camera, and modem drivers for a phone that is over 4 years old. This is not commercially viable. A: No such file exists