It's a shame I paid 2000€ for this product and some random update makes the keyboard unusable. I have called and they say it's a hardware issue (sure, right after firmware windows update, and some sensors stopped working as well). Plugged in other surface keyboards and none of them work. Resseting the surface to factory settings didn't work.
Really unprofessional support for an enterprise product. We were planning to upgrade to pro 6's for our managers and CEO but I will advice against it since Microsoft is not admiting they f*cked up with the firmware and they don't want to take any responsibility.