Very few low-ionization broad absorption line ( LoBAL ) QSOs have been found at high redshifts to date .
One high-redshift LoBAL QSO , J0122+1216 , was recently discovered at the Lijiang 2.4-m Telescope with an initial redshift determination of 4.76 .
Aiming to investigate its physical properties , we carried out follow-up observations in the optical and near-IR spectroscopy .
Near-IR spectra from UKIRT and P200 confirms that it is a LoBAL , with a new redshift determination of 4.82 \pm 0.01 based on the Mg ii  emission-line .
The new Mg ii  redshift determination reveals strong blueshifts and asymmetry of the high-ionization emission lines .
We estimated a black hole mass of \sim 2.3 \times 10 ^ { 9 } M _ { \odot } and Eddington ratio of \sim 1.0 according to the empirical Mg ii -based single-epoch relation and bolometric correction factor .
It is possible that strong outflows are the result of an extreme quasar environment driven by the high Eddington ratio .
A lower limit on the outflowing kinetic power ( > 0.9 \%L _ { Edd } ) was derived from both emission and absorption lines , indicating these outflows play a significant role in the feedback process to regulate the growth of its black hole as well as host galaxy evolution .