While Google patches FRP regularly, Engineering firmwares often have backdoors. Because ENG builds have debugging commands enabled, advanced users can use ADB (even before finishing setup) to delete the locksettings.db or bypass Google account verification.

Before we dissect the firmware, we must understand the device. "Camellia" is the internal engineering codename for the Xiaomi Redmi Note 10 5G (and its regional variant, the Redmi Note 10T 5G).

Because MediaTek devices use a different architecture than Qualcomm (using SP Flash Tool and MTK Client instead of Fastboot), the firmware structure is entirely different. The standard firmware comes in a tgz or zip format. However, an ENG firmware is another beast entirely.

If you have the legitimate Xiaomi Redmi Note 10 5G Camellia ENG Firmware.7z Exclusive file, follow this conceptual guide.

With this firmware, technicians can perform a full read-back of the eMMC/UFS chip, including the NVRAM (IMEI data) and the SecCfg partition—areas normally invisible to user builds.