Originally Posted by icanhazkindle
what exactly do I have to do if I only want to disable some of the features?
I don't want Amazon to see what I read, neither I want them to delete or edit books on my device. But I want to get firmware-updates.
You can always do manual firmware updates by downloading the update from the Amazon Kindle support site and then copying it onto your Kindle via USB. Some people prefer it this way anyway as they want to see if there are any reported issues with a specific update before applying it.