A KDZ file is the official format LG uses for its stock firmware. Unlike custom ROMs which typically come in ZIP formats, KDZ files are designed to be flashed using specific LG service tools. LG K51 (LM-K500MM). Carrier: Metro by T-Mobile (MPCS).
The file is an official stock firmware image specifically designed for the (model Go to product viewer dialog for this item. k500mm10r-00-mpcs-us-op-0902.kdz
( .kdz is often a compressed firmware format for KUKA robots or similar industrial controllers). A KDZ file is the official format LG