The (Engineering ROM) for the Xiaomi Mi 10 5G (umi)

: It includes a "KeepNV" feature in some versions to preserve critical Network Variable (NV) data during flashing, which is essential for maintaining proper modem and sensor calibration.

Engineering firmware is typically used for advanced hardware and software fixes:

: It provides a way to bypass Factory Reset Protection (FRP) and Mi Account locks without needing standard user authentication.