If you are still looking for an image for the X88pro 13 , I used the desktop image for the Mango pi M28k located here and it worked but I did not have ethernet or wifi. I just used usb wifi on it. I will see if I can get the on-board network/wifi working. I have not done a full test but it does boot up and seems to run fine. I am just using the sdcard for now and have not tried to flash the eMMC