Sennheiser does other stuff too
The question is whether they have done this trick with other kit too - Sennheiaer not only makes consumer products, but also professional kit such as near-ubiquitous radio microphones and medical kit such as hearing aids used by large numbers of NHS and private clinjcs. These days everything is set up by computer so if they have used a similar technique on the software, there could be hundreds of vulnerable computers sitting in clinics (ane TV studios) around the country.
How would we find out?
M.