Pay someone to flash it under EDL mode, my phone was stuck in fastboot, and fixed by this method. Don't waste time to try any miflash. Not work at all.
My mistake is watching the video in this post, click update bat directly not the first time install bat. The vedio title is "Update guide on the video" I think it update from Miui 12 to 12.5, but actually it is update for Miui 12.5 itself.
When running in Miui 12, MUST install the first time...
EDL or Emergency DownLoad Mode is a special boot mode in Qualcomm Android devices that allows OEMs to force-flash firmware files. This special mode of operation is also commonly used by power users to unbrick their devices.