Found a working ICS firmware
I have now found a version of Android ICS firmware that seems compatible with my DGM T-702. This firmware gives full functionality of the G-sensor and screen rotation.
If you have a DGM T-702 on old firmware PM me and I will supply a link to the firmware I am using.
I will send this information on the understanding that I bear NO responsibility if this firmware does not work on your Android device. Please research before installation. Just because this works on my DGM T-702 I cannot guarantee it will work on yours.