Honestly, most of these sellers have no idea what they are selling, and the item the sale page started with is often not even the same item they actually deliver as they may buy batches of stuff, each a different kind but generally similar, maybe with different connectors, or casing, or internals, or behavior/programming, etc.
In my experiments with cheap stuff for my wolfy project I've bought a number of things that failed or i blew up and got or bought replacements from the same source that were not the same as the originals (sometimes better, sometimes worse, but different).
Same for various ebike parts I've seen posted about here on ES over the years, especially where they post images of the ads and the parts received weren't the same.
Even if a seller did know about what they sell, they'd have to keep records of each batch and which was sold to who to know what to tell people after theyve sold them, and I doubt most of them have that kind of time (i expect most of them have multiple jobs or else mulitple sales sites to maintain plus inventory acquisition, etc, all done by just one person) or would spend it on that even if they did.
They also have to have time to check and answer messages, and be able to read and comprehend them, and that's even assuming the messaging system they use works (the one on aliexpress doesn't usually, as far as I can tell; when messages do get passed on they appear to be autotranslated very badly).
So....generally I don't expect to get the exact item being advertised, or the seller to know enough about even their current version to answer any real questions (even if they have time). If I want those things, I buy from known-trustworthy sellers that either I or people I trust have dealt with before, or sellers I research beforehand...it costs more (sometimes a lot more) but I only have to spend once if I do it right.
Anyway, just pointing out some reasons why sellers don't answer questions....
