Helpful Information - Downgrading From EMUI 11 #127 - GitHub
You must enable HDB in your phone's settings to allow the connection. Download Huawei downgrader rar
HiSuite allows users to "Switch to Other Version," which can roll back the OS to an older stable version if Huawei still supports that path for your device. Helpful Information - Downgrading From EMUI 11 #127