You could try the general ROM for 7 inch or 10 inch tablets from Eken support.
You need to find out your FWC first (for example MaiXin_MaPan_MX7650B_ETF2127_ZCC1943_A.fwc)
Then add a "+" infront of the file name, put the rom into your SD card and flash.
The rom you could find it from this FTP:ftp://22.214.171.124/
If you are not familiar with FWC and flash from SD card,
please read more in the forum.