Please use following link (Valid for Zgemmah h7c)
http://images.mynonpublic.com/openatv/6.0/zgemmah7/openatv-6.0-zgemmah7-20171025_usb.zip
Please use following link (Valid for Zgemmah h7c)
http://images.mynonpublic.com/openatv/6.0/zgemmah7/openatv-6.0-zgemmah7-20171025_usb.zip
Well after wasting a lot of time and utilizing lot of efforts. You need to download 6.0 image and flash it with that image. After installing 6.0 you may upgrade online.