Hello there,
I thought i should post this so that other users will know about this little problem.
If you accidentally hit "Upgrade" on one of the menus the next time the device boots up the language is all Chinese. You wont be able to read any of the menu items unless you can read Chinese so it's tricky to get back to English or another language.
To get back to English hit the "System" button then F2 then F1 once.
Note again you wont be able to read any menus unless you can read Chinese. After the sequence above though it is all in English again.
If you were using any other language i advise you to look at the sequence above before anything happens with the language. Keep hiting F1 until you get to the Chinese language, then count the number of times you have to hit it to get to your language. For example to get to German you
would have to hit F1 three times, but you may recognize the writing at that point. Once you get to your language, stop pressing F1 and then you can hit the back menu button (curved arrow) and that will put the device into your language mode. I dont think you have to reboot.