I have two questions:
- Once installed, will we be able to roll back to Windows Phone 8.1?
- Will Microsoft, like on the PC version, record everything that is typed and done on the phone?
Yes with Lumia software recovery you should be able to go back to the last official firmeware. (at least for Lumia devices).
I'm confused. Everywhere I read that the firmware is separate from the OS. So why would loading W10 preview change the firmware? And if I wanted to revert back to WP8.1, how would restoring the firmware remove W10 preview?