2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1512We show that, unlike the results presented previously in the literature, the transition from an outer Shakura-Sunyaev disk (SSD) to an advection-dominated accretion flow (ADAF) is possible for large values of the viscosity parameter $α>0.5$. The transition is triggered by thermal instability of a radiation-pressure-supported SSD. The transition radius is close to the central black hole. We confirm our qualitative prediction by actually constructing global bimodal SSD-ADAF solutions.12 pages, 3 figures, accepted by ApJ LetterAstrophysicstext