Pls download the softwares to your PC from the following site:
Then follow the steps below to operate the reflash process:
1. Unzip/unrar the softwares, copy all the files to the root of the tf card.
2. plug the card to the tablet
3. turn on the tablet
4. the tablet will reflash itself after being turned on for 5 mins
5. reboot the tablet
After the processes above, the tablet will be reflashed.