If it doesn't look great out of the box, return rather than calibrate. Note that some hardware really just ages terribly. Getting a really good mapping takes much more though, and since this redistributes the addressable values (noting that you may not even have the full numeric range available), you can just end up with banding or crushing details in certain ranges. All they can really do is estimate the hardware response, build a profile that models that, then build a transform (via LUT or matrix) which remaps the unadjusted output to the hardware specific target. In reality, even when assisted by a spectrometer type device, the controls just aren't very good for this kind of thing, beyond very minor adjustments. I would say if possible, catch this stuff when initially purchasing and look for brand reviews on how the hardware ages.
Unlikely the ancient CRT monoliths, these do not have meaningful hardware controls for such features. Gamma is largely baked into the hardware with LCD type panels. I'm going to omit the full explanation and just say, if this happens when new, return the thing. if you spot even a small hint of such an issue early on, return the television. You can always adjust brightness a bit to accommodate for normal viewing conditions, but really. As a TLDR, if you really really must do this, give the thing at least 30 minutes to warm up before you mess with it, and if possible, block out all ambient light.
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