You need a TWRP version specifically built for the Kirin 810 Nova 7i.
Check if Camera, Fingerprint, Wi-Fi, and Bluetooth are working. 6. Alternatives to Custom ROMs
The Nova 7i runs on Kirin 810 (HiSilicon SoC). Huawei locks bootloaders tightly. No official, stable custom ROM (LineageOS, Pixel Experience, etc.) exists for this device due to Huawei’s locked bootloader policy after 2018.