[en] The authors consider the calculation of O(Λ_QCD²/m_b²) nonperturbative corrections to B → X_sl⁺l^- decay. The analysis confirms the results of Ali et al. for the dilepton invariant mass spectrum, which were in disagreement with an earlier publication, and for the lepton forward-backward asymmetry. The authors also give expressions for the O(Λ_QCD²/m_b²) corrections to the left-right asymmetry. In addition the authors discuss the breakdown of the heavy quark expansion near the point of maximal dilepton invariant mass q² and consider a model independent approach to this region using heavy hadron chiral perturbation theory. The modes B → Kl⁺l^- and B → Kπl⁺l^-, which determine the endpoint region of the inclusive decay, are analysed within this framework. An interpolation is suggested between the region of moderately high q², where the heavy quark expansion is still valid, and the vicinity of the endpoint described by chiral perturbation theory. The authors also comment on further nonperturbative effects in B → Kl⁺l^-