It sounds like you are using Universal lnb settings on a 10750 lnb. Maybe this is why you are getting duplicates. I assume this duplicate issue is in enigma2? A 10750 blindscan feature was added to the engima2 blindscan plugins. Select Circular lnb setting in Antenna setup if you want to use a 10750 l.o. lnb. The blindscan plugin and the enigma2 receiver will recognize the circular setting as a 10750 lnb.

The blindscan plugin that is being tested here will only work in OpenPli SatdreamGr, or other image based on OpenPLi. I can also modify the OE Aliance blindscan plugin so it will have these extra scan options, but have yet to do that.

To install the plugin.py, use FileZilla or similar and transfer the plugin.py file to the receiver at:
/usr/lib/enigma2/python/Plugins/SystemPlugins/Blindscan
Transfer file,then reboot.
The correct way to do this is with telnet, type init 4, then transfer file, and finish telnet with init 3.

OS Mini users may simply download and install the whole image from the link that was posted earlier, or manually install the plugin.py file.