diff --git a/backend/plustek-usb.h b/backend/plustek-usb.h
index b98beb8a7..bd90a1f9f 100644
--- a/backend/plustek-usb.h
+++ b/backend/plustek-usb.h
@@ -48,7 +48,7 @@
  *        - changed DCapsDef, lamp -> misc_io
  *        - bPCB is now ushort to be "missused" by non Plustek
  *          devices (as threshhold for resetting sensor order)
- *        - added _WAF_LOFF_ON_START
+ *        - added _WAF_LOFF_ON_START and _WAF_ONLY_8BIT
  * .
  * <hr>
  * This file is part of the SANE package.
@@ -255,7 +255,8 @@ enum _WORKAROUNDS
 	_WAF_MISC_IO_BUTTONS    = 0x00000200, /* special handling for buttons    */
 	_WAF_USE_ALT_DESC       = 0x00000400, /* use alternate manufacturer      */
 	_WAF_RESET_SO_TO_RGB    = 0x00000800, /* set sensororder to RGB(CIS only)*/
-	_WAF_LOFF_ON_START      = 0x00001000  /* switch lamp off before scanning */
+	_WAF_LOFF_ON_START      = 0x00001000, /* switch lamp off before scanning */
+	_WAF_ONLY_8BIT          = 0x00002000  /* scanner allows only 8 bit modes */
 };
 
 /** for lamps connected to the misc I/O pins*/
diff --git a/backend/plustek-usbdevs.c b/backend/plustek-usbdevs.c
index 03aea896e..5c306846b 100644
--- a/backend/plustek-usbdevs.c
+++ b/backend/plustek-usbdevs.c
@@ -772,7 +772,7 @@ static DCapsDef Cap0x0A53_0x1000 =
 	0,                  /* number of buttons                       */
 	kNEC8861,           /* use default settings during calibration */
 	200,                /* threshold for resetting sensor-order    */
-	(_WAF_MISC_IO_LAMPS | _WAF_RESET_SO_TO_RGB),
+	(_WAF_MISC_IO_LAMPS | _WAF_RESET_SO_TO_RGB | _WAF_ONLY_8BIT),
 	_PS_INP1
 };
 
diff --git a/backend/plustek.c b/backend/plustek.c
index 55a80dd96..b9caa36d9 100644
--- a/backend/plustek.c
+++ b/backend/plustek.c
@@ -158,7 +158,7 @@
 #include "../include/sane/sanei.h"
 #include "../include/sane/saneopts.h"
 
-#define BACKEND_VERSION "0.52-1"
+#define BACKEND_VERSION "0.52-2"
 
 #define BACKEND_NAME    plustek
 #include "../include/sane/sanei_access.h"
@@ -694,8 +694,9 @@ static SANE_Status
 init_options( Plustek_Scanner *s )
 {
 	int i;
-	Plustek_Device *dev = s->hw;
-	AdjDef         *adj = &dev->adj;
+	Plustek_Device *dev  = s->hw;
+	AdjDef         *adj  = &dev->adj;
+	DCapsDef       *caps = &dev->usbDev.Caps;
 
 	memset(s->opt, 0, sizeof(s->opt));
 
@@ -743,6 +744,9 @@ init_options( Plustek_Scanner *s )
 		s->opt[OPT_BIT_DEPTH].constraint.word_list = bpp_lm9832_list;
 	s->val[OPT_BIT_DEPTH].w = 8;
 	
+	if (caps->workaroundFlag & _WAF_ONLY_8BIT)
+		_DISABLE(OPT_BIT_DEPTH);
+
 	/* scan source */
 	s->opt[OPT_EXT_MODE].name  = SANE_NAME_SCAN_SOURCE;
 	s->opt[OPT_EXT_MODE].title = SANE_TITLE_SCAN_SOURCE;
@@ -1778,6 +1782,14 @@ do_calibration( void *args )
 
 	for ( ; scanmode < 5; scanmode++ ) {
 
+		if (caps->workaroundFlag & _WAF_ONLY_8BIT) {
+
+			if ((modes[scanmode] == COLOR_GRAY16) ||
+			    (modes[scanmode] == COLOR_TRUE48)) {
+				continue;
+			}
+		}
+ 
 		dev->scanning.dwFlag |= SCANFLAG_Calibration;
 
 		if (SANE_STATUS_GOOD == local_sane_start(s, modes[scanmode])) {
@@ -1812,9 +1824,10 @@ SANE_Status
 sane_control_option( SANE_Handle handle, SANE_Int option,
                      SANE_Action action, void *value, SANE_Int *info )
 {
-	Plustek_Scanner         *s = (Plustek_Scanner *)handle;
-	Plustek_Device          *dev = s->hw;
-	AdjDef                  *adj = &dev->adj;
+	Plustek_Scanner         *s    = (Plustek_Scanner *)handle;
+	Plustek_Device          *dev  = s->hw;
+	AdjDef                  *adj  = &dev->adj;
+	DCapsDef                *caps = &dev->usbDev.Caps;
 	SANE_Status              status;
 	const SANE_String_Const *optval;
 	int                      scanmode;
@@ -2135,12 +2148,15 @@ sane_control_option( SANE_Handle handle, SANE_Int option,
 					_ENABLE(OPT_CONTRAST);
 					_ENABLE(OPT_BIT_DEPTH);
 					_ENABLE(OPT_CUSTOM_GAMMA);
-					if( scanmode == COLOR_BW ) {
+					if (scanmode == COLOR_BW) {
 						_DISABLE(OPT_CONTRAST);
 						_DISABLE(OPT_CUSTOM_GAMMA);
 						_DISABLE(OPT_BIT_DEPTH);
 					}
 
+					if (caps->workaroundFlag & _WAF_ONLY_8BIT)
+						_DISABLE(OPT_BIT_DEPTH);
+
 					_DISABLE(OPT_GAMMA_VECTOR);
 					_DISABLE(OPT_GAMMA_VECTOR_R);
 					_DISABLE(OPT_GAMMA_VECTOR_G);