Hi,
I have a Redmi Note 7 Pro (violet) which hard-bricked after a failed update. The device can still enter Fastboot and Recovery (MIAssistant) mode.
I have already opened the back cover and successfully triggered EDL Mode (9008) via Test Points. However, when I try to flash the Fastboot ROM (violet_images_V12.5.1.0.QFHCNXM_..._cn.tgz) using MiFlash (20220507), I get an error (e.g., 'Only nop and sig tag are allowed' / 'Unauthorized for EDL'). Since the bootloader is locked, how can I bypass the EDL Authentication or unlock the device to restore it?

I flash it with "UnlockTool". I bought it for three months.

https://unlocktool.net/