Re: can i change to android
No. For several reasons. Number one being Android (as you mean it) is closed source and you would have to install an unsupported version of AOSP instead. Most manufacturers also "lock" something called the "bootloader" so that the phones can only run whatever is sent with them from the factory.
You wouldn't want to run Android or AOSP on a Lumia 535 either. You get truely horrible experiences with anything else than the top tier of Android-phones.
Sent from my Windows 10 PC.