@very_rude_Turnip Slightly OT, but anyways: I am tinkering with a robot vacuum cleaner: VC-A320. It has a weak battery pack, which I am reconditioning and it has a ten pin header on its PCB, which got me thinking: JTAG. Of course I don't know anything about that, nor do I know anything about their quality.
Now if you do know which JTAG would be good to try, e.g.
this one or
this one, it would save me something like the serial CH341 hassle.