My father renewed his cell phone contract earlier this year at a shop in Chinatown. He didn't use the new phone because his old one was still working.

This weekend we tried to setup the free phone from the store (Galaxy 5) when I booted it up it was in Chinese.
I found the option to set the language to English but when I went to update the Android version I got a message saying that the build is incorrect.

I did a factory reset and it again booted up in Chinese.

I believe the store must have put in an edited version of Android so thats why I cannot update it and so on.

Is there any way to get it restored with the real Android?

Thank you