Yes, use or the eRecovery method (Wi-Fi required).
Technically yes, but Huawei prevents downgrades via dload (anti-rollback feature). You would need to unlock the bootloader (impossible on newer Huawei devices) or use IDT (Intermediate Download Tool) – not recommended for beginners. firmware huawei y9 prime 2019 stklx3 updated
: Recent rollouts include integrated Android security patches to fix various vulnerabilities. Yes, use or the eRecovery method (Wi-Fi required)