Is this a question which has a definitive (and generic) answer? I don't know, which is why I ask.
If I buy an older tablet on Ebay, which is running Android 4.4, can I upgrade it to 5 or even 6?
Is there a single answer, or is it model by model specific?
If I decide to try it anyway, I would like to hope that I can't brick it so badly that I couldn't reinstall 4.4 - can anyone confirm or deny that?
And what sort of things do I need to look out for? I imagine that older processors are likely to run newer operating systems more slowly, so performance could be an issue. But, is there anything else that I need to be aware of?
I do hope that this question doesn't get closed as being too vague, because I believe that there is/are a precise answer(s) could be very helpful to a lot of people.