Huawei, Lenovo, Oppo, Vivo, Xiaomi, and Realme.
Unplugging the cable or shutting down your PC mid-flash will instantly hard-brick the target device.
Specifically for devices powered by MediaTek chipsets, which require specialized flash tools.
Removing custom modifications and locking the bootloader to restore your factory warranty or pass banking security checks. Exploring AndroidMTK.com