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An unidentified 3.5 keV line from X-ray observations of galaxy clusters hasbeen reported recently. Although still under scrutiny, decaying dark mattercould be responsible for this signal. We investigate whether an axino with amass of 7 keV could explain the line, keeping the discussion as modelindependent as possible. We point out several obstacles, which were overlookedin the literature, and which make the axino an unlikely candidate. The onlyviable scenario predicts a light metastable neutralino, with a mass between 0.1and 10 GeV and a lifetime between $10^{-3}$ and $10^4$ s.

Heavy concerns about the light axino explanation of the 3.5 keV X-ray line