  Spectroscopic observations of the far-infrared [O III] and [C II] lines
present a pathway to explore the mechanisms of the emergence of massive
galaxies in the epoch of reionization and beyond, which is one of the most
fundamental questions in astronomy. To address this question, the Far-Infrared
Nebular Emission Receiver (FINER) project is developing two wideband
dual-polarization sideband-separating heterodyne receivers at 120--210 GHz and
210--360 GHz for the Large Millimeter Telescope (LMT) in Mexico. Compared with
Atacama Large Millimeter/submillimeter Array (ALMA), LMT provides 40% of ALMA's
light-collecting area and a similar atmospheric transmittance, but FINER plans
to have an instantaneous intermediate frequency (IF) of 3--21 GHz per sideband
per polarization which is five times wider than current ALMA's bandwidth.
Therefore, FINER is going to offer cutting-edge spectral scanning capability in
the next several years.
  The project is currently in an active development phase. In this proceeding,
the latest development status for FINER, including the optics, wideband
waveguide components as well as low-noise
superconductor-insulator-superconductor (SIS) mixers is reported.
