Hi @Joh158
Thanks for your feedback because this is really important for us.
Have you any experience in flashing devices?
I am asking because one of the developers here has been making a custom kernel (boot) image that specifically tries to fix the problem with the heart rate sensor and dark skin.
If you are interested in trying it then I will put together a package for you that has all you need to try it.
It’s actually a simple process and you need a Windows PC or laptop to use it.
The other thing is going back to the previous version is also easy so you have a way back with no problem.
Let me know if you are interested.
More information here in his thread
Cheers