Xiaomi Redmi 6 | 6a Cactus Eng Rom

fastboot flash boot boot_eng.img
fastboot flash system system_eng.img
fastboot -w

Via hidden engineer menu (*#*#3646633#*#* → Connectivity → CDS Information → FRP erase).

Note: This method assumes you are flashing a full Eng ROM via the Scatter file.

To repair baseband or network issues:

The Redmi 6 (Cereus) and Redmi 6A (Cactus) are budget devices that eventually stopped receiving major updates. Users often turn to Eng ROMs for the following reasons:

ADB shell grants UID 0:

adb shell
cactus:/ # whoami
root
cactus:/ # mount -o rw,remount /system

Author: Mobile Firmware Research Division
Date: April 18, 2026
Device Code Name: Cactus
Models Covered: Redmi 6 (3/4GB RAM), Redmi 6A (2GB RAM)
SoC: MediaTek MT6762M (Helio P22)

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. Xiaomi Redmi 6 6A Cactus Eng Rom

Unlike the standard Global Stable or Developer ROMs found on retail units, Eng ROMs have: