Yes, they did, but I asked permission to try this procedure: Hi10 Go drivers - #15 by parphane before send it back to Chuwi.
It will reboot the system into the factory test mode, after that I can chose a ´Cleanup´ option and restart the OS.
To see the tablet problem, try to watch the vídeo I recorded. It´s available on https://photos.app.goo.gl/qrHpmU3n5YBMcRqU8.
Please, tell me if I on the right path to solve it.
Thank you very much for your reply and attention.