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We present an update on the calculation of $\bar{B}\to D^\ast \ell \bar{\nu}$semileptonic form factor at zero recoil using the Oktay-Kronfeld bottom andcharm quarks on $N_f=2+1+1$ flavor HISQ ensembles generated by the MILCcollaboration. Preliminary results are given for two ensembles with $a\approx0.12$ and $0.09$ fm and $M_\pi\approx 310$ MeV. Calculations have been donewith a number of valence quark masses, and the dependence of the form factor onthem is investigated on the $a\approx 0.12$ fm ensemble. The excited state iscontrolled by using multistate fits to the three-point correlators measured at4--6 source-sink separations.

Update on $B\to D^\ast \ell \nu$ form factor at zero-recoil using the Oktay-Kronfeld action