If you want to do a factory reset of the Dopo M975, ifixit has [[DOPO 9” Internet Tablet (DOPO BPO m975) Troubleshooting Page#Section_How_can_I_reset_my_tablet_without_potentially_losing_all_of_my_data|instructions]]. View the question, Why does my tablet keep freezing?
This will erase any data on your tablet.
I also found a tutorial on [https://m.youtube.com/watch?v=fMDDI0A7Uk8|youtube] that shows how to change the language to English, that may help you. You could view other videos with similar titles that might be closer to what you're looking for as well.
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Lastly, page 19 of the [http://www.google.com/url?q=http://www.doublepowertech.com/download/m975manual.pdf&sa=U&ved=0ahUKEwiOytj-vtHOAhVILB4KHUmjB7oQFghLMA0&usg=AFQjCNHYDv7hq-i0naZLUHThPocfwdX2kg|manual] has a screenshot of the English menus that you could use the respective icons to Navigate to the language menu that can help complement the video I referenced.
If you want to do a factory reset of the Dopo M975, ifixit has [[DOPO 9” Internet Tablet (DOPO BPO m975) Troubleshooting Page#Section_How_can_I_reset_my_tablet_without_potentially_losing_all_of_my_data|instructions]]. View the question, Why does my tablet keep freezing?
This will erase any data on your tablet.
I also found a tutorial on [https://m.youtube.com/watch?v=fMDDI0A7Uk8|youtube] that shows how to change the language to English, that may help you. You could view other videos with similar titles that might be closer to what you're looking for as well.