This article records the entire process of the author's attempt to downgrade the Honor 20 mobile phone from the Hongmeng system to the Magic system, which ultimately resulted in the device becoming bricked. The article describes in detail the preparations before flashing, the tools and software used, as well as the specific problems and challenges encountered during the downgrading process. Although the author invested a lot of time and money, in the end the phone could not be used properly due to operational errors....