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We measure the photon-energy spectrum in radiative bottom-meson ($B$) decaysinto inclusive final states involving a strange hadron and a photon. We useSuperKEKB electron-positron collisions corresponding to $189~\mathrm{fb}^{-1}$of integrated luminosity collected at the $\Upsilon(4S)$ resonance by the BelleII experiment. The partner $B$ candidates are fully reconstructed using a largenumber of hadronic channels. The $B \rightarrow X_s \gamma$ partial branchingfractions are measured as a function of photon energy in the signal $B$ mesonrest frame in eight bins above $1.8~\mathrm{GeV}$. The background-subtractedsignal yield for this photon energy region is $343 \pm 122$ events. Integratedbranching fractions for three photon energy thresholds of $1.8~\mathrm{GeV}$,$2.0~\mathrm{GeV}$, and $2.1~\mathrm{GeV}$ are also reported, and found to bein agreement with world averages.

Measurement of the photon-energy spectrum in inclusive $B\rightarrow  X_{s}\gamma$ decays identified using hadronic decays of the recoil $B$ meson  in 2019-2021 Belle II data