Flash the stable software back onto the phone using either (via the official scatter file) or the official Mi Flash Tool while your phone is in Fastboot Mode.
Download a compatible version of the Smart Phone Flash Tool (typically v5.x or newer). Step-by-Step Installation Guide via SP Flash Tool
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A: Yes, but use Fastboot mode and select “Clean All” (do not lock bootloader).
: Open the bypass tool, click "Bypass," and connect the phone while holding both volume keys to enter the MTK COM Port SP Flash Tool Flash the stable software back onto the phone
Official Chinese ROMs do not include Google Play Services and are primarily intended for the Chinese market.
Before making any major changes, it is highly recommended to create a full backup (including your NVRAM, which stores your IMEI numbers) using tools like the SP Flash Tool or TWRP itself. This link or copies made by others cannot be deleted
Opens up diagnostic ports to rewrite missing or corrupted IMEI numbers.
What is the or hardware issue you are trying to fix?
: Restores bricked, boot-looping, or dead devices.
An Engineering ROM (often called an "Eng Boot" or "Engineering Firmware") is a specialized version of the Android operating system used by Xiaomi developers and engineers for debugging and hardware testing.