Some of these scanners are supported by the gt68xx backend now.

unsupported/plustek-opticpro-st12.html

@@ -36,10 +36,10 @@
     </p>
     <h2>Comments</h2>
     <p>
-      It was previously mentioned that this scanner (product id 0x040b) uses a GL646, but this seems
-      to be wrong. So it may be supported by the gt68xx backend in
-      future. However, there are newer reports that the product id is is 0x0600
-      and that this model uses a gl646. Strange. Please send more reports!
+      These scanners use two different product ids and therefore have different
+      hardware. The scanner with product id 0x040b uses a GT6816 chip and is
+      supported by the gt68xx backend. Scanners with product id 0x0600
+      use a gl646 chip which may be supported by the genesys backend in future.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v</h2>
     <pre>