Match the support note to the symptom
The publisher has separate Apple TV notes for Dolby Atmos trouble and inability to play4K content. Both mention turning off HDR in the OSN+ application. Read that as a targeted troubleshooting recommendation, not a claim that HDR is always defective or that every audio problem comes from picture settings. Record whether your actual problem is failed playback, missing immersive audio or a different symptom.
Keep application and system controls distinct
OSN+ places its HDR switch under Settings, Playback and HDR. The4K article additionally points to Apple TV’s own Video and Audio settings and a 4K SDR format. These are different control surfaces. Note the original settings before changing them, then try the documented sequence on the same problematic programme. That makes it possible to tell which change affected the result and to restore the previous configuration when appropriate.
Retest without claiming a universal fix
The same article first asks for the OSN+ app and television to be updated. After checking versions and applying the published workaround, return to the original title and playback route. Successful playback of one item would support that limited observation; it would not certify every title, Atmos output chain or television mode. If the problem persists, preserve the model, software versions and exact behaviour for support.
Check subscription features before changing hardware
OSN+’s plan help associates4K and Dolby Atmos with Premium and describes upgrade eligibility by purchase route. A troubleshooting setting cannot add a feature absent from the account’s plan. Check both entitlement and the selected programme’s available format before treating replacement cables or equipment as the next step. This article reports the publisher’s instructions; no Apple TV playback test was performed for it.
Questions, answered
Is HDR Off a guarantee that Atmos will work?
No. It is a published troubleshooting step for the named symptom.
Can changing Apple TV format add Premium features?
No. Account entitlement and programme format remain separate requirements.