The fact that it's a garbage off-brand speaker makes it more likely that it's possible, because people with valuable brands are the ones who are most likely to want to prevent you from changing it, and also the most likely to actually design their own product internals or have them designed to spec. The cheap brands are most likely to grab a complete PCB off the "shelf", or even more likely than that, just have their crappy brand put on someone else's complete product.
But, and it's a big one, they won't be offering the user the tools to do it with. They'd have to figure out who actually made it and/or what chip is on it in order to identify the tool, then they'd have to track it down, then they'd have to maybe short something on the PCB because it's not necessarily as easy as holding down a button, they'd have to do it on a windows PC or at least by attaching a USB hub to a windows VM so that when the device inevitably changes IDs during the reflashing procedure it remains connected, or with some kind of reflashing tool which is cheap but which they definitely don't own.