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Hi Al
I tried to scan with two R820T.
I open two Scanner window and set different index nunber at preferences
But when I click Start Botton one will start scanning,and another show "Error : Error code -12 when opening SDR (device index = 0)" and couldnt start scanning
In Plonpt line it says (Plesase fix the device permissions, e.g. by installing the udev rules files rte-sc(~cant see~)
usb_open error -12
I hope this feed back help to find way to solve this case