Send the phone to China. They can unlock it.
Or Taiwan, or Korea, or Vietnam....all of which might be where it is made, designed, etc.
A couple of months back, I was in the market for a new cell phone. I learned that while most phones, Apple iPhones come with internal storage locked down from the start. Buy a 16GB, or 32Gb etc.
Anyway I then saw a video from somewhere in Asia whereby a techy guy was taking an iPhone completely apart, showing it was possible to add memory.
Whereas for an Android you simply by a micro-SD card and put it in yourself,,..for $10-40.