Following the thread started/ended here because the device being troubleshot changed. viewtopic.php?f=28&t=146669#p1215726
I'm having the same exact issue as user Orsen. Raspbian stretch 4.9.41 v7+ kernel. Driver installs via MrEngman's script but no networks are joinable and none of the SSIDs have signal strength indicators.
I'm trying again on a fresh Jessie image to see if Stretch is the culprit, but I was hoping maybe someone else had found a resolution since September?