Once you have an unlocked bootloader and a custom recovery installed, you can flash your chosen English ROM.
The following is a general guide based on community experience: Xiaomi Redmi 6 6A Cactus Eng Rom
Ensure your phone has at least 30% charge. MediaTek USB VCOM Drivers: Installed on your computer. Once you have an unlocked bootloader and a
This article provides a comprehensive overview of the Xiaomi Redmi 6/6A "Cactus" Engineering ROM, its use cases, and how to safely flash it. What is an Engineering ROM? its use cases