Actually supported now.

unsupported/microtek-scanmaker-4800.html

@@ -40,6 +40,9 @@
 	3800</a> which is reported to use the same chip.
     </p>
     <h2>Comments</h2>
+    <p>
+      This scanner is now supported by the sm3840 backend.
+    </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v</h2>
     <pre>
 T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=12  MxCh= 0